From personal experience, this is the best product I have so far found for my 21 year old Volvo. The engine has covered 208,000 miles without a rebuild and still has excellent oil pressure. Minor hydraulic tappet noise on startup has been virtually eliminated.
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been using this with my portable petrol generators for some years now with no problems
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If I use synthetic oil in My 2001 mm 4 golf the engine oil level drops - but no exhaust smoke Using Castro gtx 15-40 the oil level remains completely stable
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Great Oil at the right price..
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Great product Castrol I find it the best oil for my boat engine.
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