at highway speeds, which will hold up better?

Status
Not open for further replies.
Joined
Oct 9, 2002
Messages
556
Location
Michigan
i was just thinking about this, if synthetic is for stop and go driving, how would it handle at highway speeds for long periods of time compared to conventional oil? example mobil 1 5w30 synthetic and regular castrol gtx 5w30.
 
Joined
Nov 15, 2002
Messages
8,937
Location
SC
All things being equal, and under similar conditions, a synthetic oil will "hold up better" than a conventional oil.
 

Al

Joined
Jun 8, 2002
Messages
19,553
Location
Elizabethtown, Pa
Thats a good question. I think the question is very complicated. You have the base oil and the additives. The additives can wear out as the oil absorbs impurities and oxidizes. The base oil can "shear down" (becomming thinner) or thicken out. My guess(based on nothing) says that under any conditions the synthetic (PAO) outlasts the Mineral oil by the same percentage.
 
Joined
May 28, 2002
Messages
2,480
Don't think there's one area that a conventional oil will beat a synthetic...except price. Even highway engine speeds...
 
Joined
Jan 26, 2003
Messages
9
Location
Canada
It depends if you change your oil every 3k miles, if you do use the Castrol 5w-30. If you extend it to 5K miles use the synthetic. [ February 01, 2003, 07:19 PM: Message edited by: Tommy the Greek ]
 
Joined
Nov 17, 2002
Messages
3,023
Location
USA-Michigan
Thats not an easy question. [I dont know] All kinds of factors would come into play, the oil, the vehicle, the condition of the vehicle, the conditions its operating under, the ambient temperature, etc, etc. But given the choice, I would always go with the synthetic, no matter what the brand.
 

Patman

Staff member
Joined
May 27, 2002
Messages
22,037
Location
Guelph, Ontario
Look at it this way guys. At a steady highway speed, with the engine warmed up, you don't put a lot of stress on your oil (unless your engine revs at 4000rpm or something!) so you really don't need synthetics for this type of driving. I'd be willing to bet if someone did a trip across the country and back, and one way they used synthetic and the other way conventional, the wear numbers would be virtually the same.
 
Joined
Aug 4, 2002
Messages
922
Location
Ontario , Canada
unfortunately many Hondas (given this users screen name) hover around 4000 rpms at highway speeds, so I say a good synthetic is preferrable, at least for over 4000 mile drain intervals. But I would take Castrol GTX to 4000 miles without any worries though.
 
Joined
May 27, 2002
Messages
3,347
Location
Bolivia
I believe that for high speed driving the synthetic is better. Your tendency is to run hotter after about 60 mph from the resistence to air where the engine runs harder. Look at some to the Car and Driver (or other) test reports and you will see that with the smaller engines, top speed is not always in the top gear. In the top gear the engine works HARD in a small engine, causing more wear, more need for the extra bit (albeit small) of hp that a synthetic gives you. Also less apt to oxidize
 
Status
Not open for further replies.
Top