I never run sythetic oil in anything.I have 250,00 on my impala,and we run our company vehicles to 300,00 before replacing and have no trouble with convetional oils.Once a month at 5,000 apox.
Just finished a nightmare on a claim for $6,000.00 for an engine in a honda oddesey that toasted a moter with sythetic at 28,000 miles.
He let honda handle the first 2 oil changes,and at 10,000 miles switch to a leading brand "signature 30,000 mile oil" and at 14,000 toasted the engine.
Honda would not cover it as the oil wasnt change before the 8,000 mile enterval the manuel says,and mentioned they have seen this before with oddeseys(mini van) and blamed the oil supliers "signature 30,000 mile filter"
The oil suplier tested the oil,claimed it had 16,000 left to it,but would not coment on the filter.
The oil suplier paid the owner of the van $6,000.00 with little argumant,pulled the filter from the distributers,and had the car owner sign a pile of papers stateing this "was not a claim" becuase the havent had one of those since 1975 :smilie_happy:
As a distributer(at work) I wont mention the oil company,and I am not totally against sythetics,I especially like the ATFs,grease and gear lubes but I see to many people who believe that using a high millage sythetic oil meens they dont need to maintain there car for the next 20,000 miles and thats a bad thing.
Fleet oils,like ROTTELA,DELRAY,DELVAC,VALVOLINE PREMIUM BLUE,GAURD-ALL.... are designed for heavy duty use,have great anti shear capabiltys,contain zinc and are capable of long drain intervals even being non sythitics.Most are speced for 65,000 miles or more but that is in semis with special care,bypass filters and frequent filter changes.You cant just run that many miles with out the right equipment and care.
Another option is hi zinc oils such as JOE GIBBS oils.These oils are designed for older and hot rod engines with solid lifters (LIKE OUR 1100s).Modern automotive oils have taken out alot of the additives,such as zinc,because modern engines dont need it,and its hard on catylist (witch our 1100s dont have).They have replaced zinc with molly,witch is bad for wet clucths.
Even if its a sythetic,these additives are changed as long as its a certified energy conserving oil,reguardless of brand we need a specialty oil with hi zinc for the lifters and cam and hi shear capabiltys for the trans.
Now you did it,you dragged me into an oil tread. :rtfm: :rant:
