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Engine Oil Recommendation for BMW B48

Practical Engine Building

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Discussion and questions related to the course Practical Engine Building

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Good day,

I am currently looking at doing an engine rebuild on a BMW B48 engine (basically 4 cylinder supra).

I have viewed the engine rebuild course.

However, BMW recommends using a synthetic oil A3/B4 Spec while your course states using a mineral grade oil for the break in period.

BMW does not have any specifications for break in oil.

Could you advise if I should use a mineral grade oil 5W30 for break in even though it deviates from the manufacturer specifications?

I am a bit concerned if any other parts may require fully synthetic oil.

Thank you.



Hi Shane, it's not usual for a manufacturer to specify a break-in oil as this isn't really something the end user would typically be doing. While yes, a full synthetic would definitely be my recommendation once the break in is complete, I'd still use a good quality mineral based oil for the break in process.

Hi Andre,

Thanks, I am planning to use mineral grade for break in and then switch to synthetic.



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