When did you start putting in synthetic oil? (Castrol Edge Titanium)

2011 Nismo#91

Use what ever oil you feel happy with. Then when you change oil do a used oil analysis on it to see if the oil is still doing its job well and how your engine is doing. Then based on the numbers in the results stay with that oil or upgrade to something better or change more often.

All these qualitative results given, rough/loud/slow/hot/black etc don't give you any real quantitative data to make a solid decision on.

SouthArk370Z

I agree with all of that but think, for the majority of DDs, UOA is overkill. If you race (or drive real hard), have FI, &c, UOA can be invaluable. For most DDs that only see occasional "spirited" driving, use a high-quality oil/filter (lots of threads on that), check level (with a quick visual/olfactory/feel check on condition) often, change per manufacturer's recommendations (usually very conservative; if you baby the engine, you can go longer), and enjoy. YMMV

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