"Actually Guys, the reason I started this thread is becauce the service manager at my Isuzu Dealer told me recently to stop using 93 octane. He also switched my VX from synthetic oil (which I've used from my first oil change). I believe his exact words were " this engine wasn't built for 93 octane gas or synthetic oil, it will run smoother and better with 87 and regular oil".
Is this BS?"
Your service manager is a wanker.
Synths are fabricated, (not refined) for the maximum lubrication of ALL internal combustion engines. With hydrocarcabons that are... Whatever. Its a long story and it's gettiing late.
Early synthetic oils tended to suck. But then again early engines tended to suck.
That was then, this is now, synthetic oils and and engines are times better. Even gas tubines can benifit from the wholesome creamy goodness of synthetic oils.
Mobil 1 syth is now the finest motor oil INVENTED.
Air Force One uses Mobil 1.
As far as octane...
Do what you feel man, but I'm not hip to $2.00 a gallon. But that's my view I could be wrong.
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