I 'participate' in GMC and MCI bus groups. I plan on getting a 40' bus and making a motorcoach. So i need to learn all about that that end of the world - and boy is it different! Diff volts, lots of air controlled things(like belt tension!), no sparkplugs, $3500 clutches, $2000 oil cooled alternators, etc

I have a lot of background in motorcycles, and the additive package and base oil (or synth) is a major issue over there...you CAN run Pennzoil et al in your jap bike, BUT motorcycle specific oil is sooooo much better (due to additive package) that you'd be a fool to run car oil. Remember, a bike oil resevoir feeds teh engine, the trans (stick shift gears type) and the clutch (wet multiplate like in a car automatic). And add in that it has to take air cooled temps....the proper fluid is CRITICAL (ask a GOldwing owner that has run non-Honda Antifreeze...the 'sand' in regular antifreeze will chew up his water pump seal...ahh, details!) Different brakds run different incompatible fluids too - japs use DOT4 and Harley uses silicone brake fluid...and the list goes on and on!

SOO, when these bus wahoos ask stupid questions (what is a 3 point turn, how do you drill out a rivet, etc) and then they put 10w40 in the trannie and claim it runs BETTER, i need to ask a group that has a clue about such things...this group!

BTW, i dislike the smell of 90 wt. I have, umm, bathed in ATF (who hasn't) and it ain't too bad, or at least better than 10w40!