"FAIRFAX, Virginia (August 13, 2003) -- ExxonMobil today announced that Mobil 1 with SuperSyn has been selected as original equipment (factory fill) for Mitsubishi Motors' 2003 Lancer Evolution VIII. The fully synthetic motor oil will also be included in Mitsubishi's manufacturer's maintenance program designed specifically for the Lancer Evolution VIII. Each new vehicle will be filled with Mobil 1 with SuperSyn viscosity grade 10W-30."
"FAIRFAX, Virginia (February 14, 2003) -- ExxonMobil today announced that Mobil 1 has been selected as original equipment (factory fill) for Porsche's new line of Cayenne sports-utility vehicles -- the Cayenne S and Cayenne Turbo. Each new vehicle will be filled with Mobil 1 viscosity grade 0W-40."
"FAIRFAX, Virginia (July 23, 2002) -- Mobil 1 (R), the world's leading synthetic motor oil, has been selected as original equipment (factory-fill) in Cadillac's all-new luxury roadster, the Cadillac XLR. The Cadillac XLR will be factory-filled with the 5W-30 viscosity grade of Mobil 1 with SuperSyn (TM).
EVO joins the crowd
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float_6969
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2015 SV Leaf w/QC & Bose (daily) - Location: Topeka, Kansas
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Q45tech
- Moderator
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- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
The choice of the hot vicosity is a function of the rod and crank bearing clearances and the engineers desired oil pressure.Whether 20, 30,40, even 50 is the one you want must be determined by detailed precise measurements..........not I think this is right, or what someone says is good...............depends on engine and mileage and abuse.
On USED Q we know we must start at Xw30 and stay with that or move up cautiously.An interesting question for thought is how does synthetic vs conventional behave when the oil is above the 210F measurement point.............my guess is that a 30 weight syn acts more like a 40>50 conventional when above this temperature....[resists thinning out].
Other than extra friction from too thick an oil [gas mileage], doubt you can do any harm with thicker oil in the warm seasons when cold temperature exceeds 60F.Since you are changing the oil every 90 days you have 4 opportunities to vary the mix during the year based on temperature.
On USED Q we know we must start at Xw30 and stay with that or move up cautiously.An interesting question for thought is how does synthetic vs conventional behave when the oil is above the 210F measurement point.............my guess is that a 30 weight syn acts more like a 40>50 conventional when above this temperature....[resists thinning out].
Other than extra friction from too thick an oil [gas mileage], doubt you can do any harm with thicker oil in the warm seasons when cold temperature exceeds 60F.Since you are changing the oil every 90 days you have 4 opportunities to vary the mix during the year based on temperature.
Interestingly, several EVO tuners are recommending immediately dumping the factory synthetic fill and refilling with dino oil for break in purposes because they are seeing abnormal bearing wear on cars broken in with synthetic. Whether synthetic oil is really the problem or not, I don't know. After driving a Mitsu product for 6 years, I suspect the oil isn't the real problem. 
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nuQ
- Posts: 1659
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2009 Dodge Caliber SXT - Location: Bethlehem PA
interesting point wes, was wondering the same thing myself, my 90Q has about the same mileage as yours. most other members here recommend changing to all synthetic. my second oil change is about due, i'm using valvoline durablend 10w/40 now. did an engine cleanup the last oil change with sea-foam for the last 100, gentle miles, and a quart of mobile 1 syn.trans. fluid 15 minutes before the drain. i'm pretty sure my Q had very regular oil changes, it looks very clean in the filler hole. i guess MY question, comes from wes's last post, if a Q has run on dino oil for close to 100k, is a changeover to synthetic worth it, either monetarily or performance/longevity wise???????? i'm trying to do the slow cleanup, change to total synthetic switch. what do the experts have to say?????? is the added expense worth it????? plan on keeping the Q till' i bury her (unless i hit the lottery/inheritance and buy a m45/g35coupe in the next couple years!!!LOL).