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Castrol Forum

Professional automotive forum, sponsored and run by Castrol, for discussion of Castrol oil products. Messages may include, but are not limited to, passenger car motor oil, motorcycle oil, automatic transmission fluids, other fluids, motor oil types, product specifications, product applications, and other related topics. This forum is for experienced automotive repair professionals only, membership required.

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Recent Automotive Discussions in the Castrol Forum

1938 Briggs and Stratton
05/23/2019 in the Castrol Forum
I recently acquired a vintage garden tractor with a 4 hp Z model Briggs which runs well and appears to be very clean inside.I believe it has not been apart and is all original.The manual called for sae 20.Would that have been non detergent?What would a mo...
Dexos backward compatibility benefits
05/13/2019 in the Castrol Forum
I was wondering if their is any advantages using Dexos engine oil in an engine that calls for non dexos, specifically a 1998 GM LS 5.7L V-8 with 120K. I already recommend Dexos in every ECOTEC engine that comes in my bay. I am aware of the claimed benefit...
engine oil contamination
05/09/2019 in the Castrol Forum
Got a question for Castrol. We have a fairly fresh rebuild on a 2007 5.3 GM AFM engine that has some type of contamination that has darkened the 5-30 Mobil 1 synthetic in about 2500 miles to the point of gumming up lifters and requiring teardown. Not sure...
Customer wants synthetic Mercon ATF
04/23/2019 in the Castrol Forum
Most I see are Mercon and MerconV compatible. This concerns me. Is Castrol Transmax synthetic? Any suggestions to who makes a synthetic Mercon? TIA John.

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