Expert Commentary in action
In December 2025, BP agreed to divest a 65% majority stake in Castrol to US-based infrastructure investor Stonepeak, valuing the business at an enterprise value of $10.1 billion. BP will retain a 35% interest, with the transaction anticipated to complete by late 2026.
As investors evaluate the prospects of a more independent Castrol, the central focus turns to the potential opportunities created by this transition in ownership. The initial market reaction was positive, with Castrol India shares rising as much as 9% on the day of the announcement. That optimism was echoed in a Third Bridge interview conducted by analyst Olly Anibaba with a former top executive at Castrol India, who set out a broadly positive view on margin and cost savings.
However, through the Expert Commentary feature in the Third Bridge Library, other industry experts have been weighing in on the debate, highlighting areas of consensus and conflict on the outlook. Here are some of the key themes the debate is unfolding around.
Can synthetic double the margin?
The starting point is a market that is no longer growing on volume. The expert told us that the lubricants market in terms of volume is not growing anymore, and it is more driven by value. Synthetic products are the future and are estimated to grow at two to three times the traditional market.
The expert went further, estimating that Castrol's margins could potentially double with synthetic lubricants.
"Castrol's margins currently sit at 20-25% but could potentially double with synthetic lubricants, which command premiums up to 100% over traditional products, despite higher production costs. [The] synthetic lubricants market is expected to grow 2-3x faster than traditional lubricants, with Castrol falling behind competitors." —— a former top executive at Castrol India.
That bold claim raised doubt among other experts. While they broadly agree that synthetic products are the future, there remains doubt as to whether the margin could really double.
"Castrol's current margins are already above the lubricants industry average. Synthetic lubricants do offer higher profitability, though not a clean 'doubling' without a major volume and mix transformation." —— a former senior executive at Shell India.
"I think those margin levels are overstated if applied to the entire portfolio. I would expect a significant proportion of Castrol's business to be with high-volume OEM customers where margins are thinner, but volumes are large and rateable." —— a former Shell supply chain executive.
Another expert said the current margin already reflects the higher-margin synthetic business Castrol has been in for decades.
"But Castrol is already operating in the synthetic lubricants market now, and has done so for decades, so this is not an untapped market that Castrol has not yet entered. The 20-25% margins will already include this existing synthetic business. Castrol would be well placed to grow in this market, and I think it's incorrect to say they are falling behind competitors. Yes, synthetic margins are higher, but Castrol is already enjoying that."—— a former marketing manager at BP Lubricants.
How far can supply chain diversification really go?
According to our first expert, BP ownership provided much needed stability in the supply chain, but that stability came with a trade-off. Under BP, Castrol was locked into a single supplier for additives for years, and diversifying the supplier base was not something BP's structure allowed. With new ownership, the expert sees room to unwind that constraint through onshoring and regional sourcing.
"Supply chain diversification could generate immediate cost savings of 3-5% by reducing dependence on single suppliers and enabling regional sourcing partnerships that were restricted under BP ownership."—— a former top executive at Castrol India.
Expert Commentary surfaced that some experts agree, provided Castrol structurally unwinds legacy BP procurement constraints, and see cost savings that could be even larger.
"Agree with the logic. Savings could come from a diversified supplier base and regional sourcing strategy. Castrol will now have greater flexibility and decision-making ability, and the long-term opportunity could be 8-10%." —— a former Shell India business head.
Others caution that the savings may be real, but that it could come with more risk.
"The 3–5% savings is credible, but only if Castrol can structurally unwind legacy BP procurement constraints without sacrificing supply reliability or quality consistency."—— the top executive of an energy company.
Some say the real savings could be lower once R&D costs and technical co-development agreements are factored in.
"Single suppliers are a necessity in some parts of the portfolio where supplies enter into tailored formulations, often supported by technical co-development agreements and in the much sought-after first fill and linked aftermarket PCMO markets." —— a former Shell lubricants supply chain manager for EMEA.
Can lubricants go D2C?
Perhaps the braver claim on the call takes reference from quick commerce in FMCG, which has not happened in the lubricants industry yet, to cut cost by using a digital model to reach customers directly instead of the warehouse model.
"Digital distribution models could eliminate multiple distribution layers, potentially saving 4-5% in costs by moving away from traditional warehouse and distributor networks towards direct commerce." —— a former top executive at Castrol India.
As the debate in the comments continued to unfold, this claim raised doubt among a number of experts, who have questioned not only the amount of savings but also the supply chain risk.
"I don't believe you can ever eliminate the traditional distribution networks. There are many reasons why traditional networks persist which cannot be ignored, the need for service levels, oil sampling, stock holding, etc, in certain market segments."—— a former BP Lubricants executive.
"In my experience, savings in distribution are possible, but must always be balanced against supply chain risk. Warehouse models will remain an important part of any blended model." —— a former Shell lubricants supply chain manager for EMEA.
"Disintermediation can drive 4-5% savings, but it risks channel conflict and loss of installer or mechanic loyalty, which remains critical in lubricants."—— the chief executive of an energy company.
Is Castrol ready for industrial specialties?
One of the final claims during the initial expert interview shifted from cost savings to expansion. Industrial specialties, which include products such as metal working fluids and cooling fluids used across manufacturing and heavy industry, is a segment where the expert sees Castrol lagging its larger rivals.
"Industrial specialties segment remains significantly undertapped for Castrol globally, presenting major expansion opportunities where competitors such as Shell, TotalEnergies and ExxonMobil currently dominate market share," said the former Castrol India chief executive.
From the discussion, it is clear that other experts believe the opportunity is there, but equally, some question whether Castrol is ready for it and say it requires application-specific solutions rather than pure product expansion.
"Agree. Breaking open long-standing OEM relationships is key here to penetrating this market. Elaborate technical offers and partnerships represent high barriers to entry for new players."—— a former Shell lubricants supply chain manager for EMEA.
"Yes and no. If you want to enter a certain (OEM) market or business, you can be successful, it's just a matter of time and budget. Shell entered into BMW PCMO in 2012, kicking out Castrol, which nobody expected. That is absolutely correct. Castrol is lacking in industry business and a clear segmentation in areas they want to focus on. With such a strategy, they need to obtain the OEM approvals and build a robust supply chain with their own production sites and sales teams. This will enable Castrol to generate organic growth in certain industrial areas."—— a former Shell supply chain executive
Conclusion
Castrol India's shares rose as much as 9% on the day BP's exit was announced, but the transcript above shows a more complicated case underneath that reaction. The supply chain saving drew the least resistance from other experts. The margin doubling and the move to direct commerce drew the most. Whether that early optimism holds up will depend less on the numbers in any single claim, and more on how well Castrol executes on all four fronts at once.
About Expert Commentary
Expert Commentary is a transformative enhancement to Third Bridge's content library. This new feature provides clients with multi-faceted, peer-reviewed insights by integrating additional expert perspectives directly into the key takeaways of Third Bridge Analyst-led interviews.
For further details on how Expert Commentary sharpens high-conviction investment decisions, check out our blog.
Relevant transcript
27 Mar 2026 Castrol – Ownership Restructuring & Synthetic Lubricants Scalability
References
1. https://www.castrol.com/en/global/corporate/about-castrol/newsroom/castrol-stonepeak.html
All insights in this article are based on information provided by Third Bridge experts.
For media enquiries, please contact: comms@thirdbridge.com
