Motor Oil question
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New User
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Motor Oil question
I currently run Mobile 1 synthetic in my Diesel. The engine has 87,000 miles on it, all with Mobile 1 synthetic, other than the oil that was in it when I picked it up at the dealer the day I bought it.
At the Ford garage the other day, they told me that I should only be running the oil that Ford reccomend and that a fully synthetic oil is actually going to cause damage to my engine. Is this true? Or are they trying to get me to buy my oil from them, so thy can charge me the $200 for the oil change? The back of the oil quart shows it meetiung all of the ratings required by the owners manual.
Thank s All
At the Ford garage the other day, they told me that I should only be running the oil that Ford reccomend and that a fully synthetic oil is actually going to cause damage to my engine. Is this true? Or are they trying to get me to buy my oil from them, so thy can charge me the $200 for the oil change? The back of the oil quart shows it meetiung all of the ratings required by the owners manual.
Thank s All
Fleet Owner
Joined: Jan 2004
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From: Brentwood,CA
well yes and no. ford does not approve of 5w40 being used above 30 degrees and prefers 15w40 . the 5w40 will work fine. synthetics shine in cold starts and long OCI's but offer nothing else. you will notice synthetics show higher startup wear on most UOA's. Its becuase the oil being so pure and uniform and does not stick. so a tackifier is used to help it. also all but ester based synthetics come from crude oil , some people seem to think they're all made from thin air in labs this is just not the case.
Lead Driver
Joined: Oct 2004
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From: Columbia, MO
There used to be some reports that switching to a synthetic will cause some oil leaks to show up. The theory is that the dino oil is thicker and may have caused some very minor swelling of seals. When you put synthetic in it, it is thin enough and didn't expand the seals, so it leaked. If you've been running synthetic since day 1, you should have nothing to worry about. I switched to synthetic at 100K, and have yet to have any problem show up. I think you're good to go.
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Synthetic oil for 1.99 a quart? Besides, Ford is telling me to NOT ruin synthetic. I apologize, they wanted like $175 for the oil change. But I rounded up, because they always find somehtign else to rope you on.
Thanks all for who responded.
Thanks all for who responded.
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Danged ole Rotela 5 danged ole 40 Synthetic man. With a danged ole K&N Oil Filter there man. What ya using that danged Mobil 1 there man. That danged ole Mobil man, dont they support that danged ole Aparthied there man. Talkin bout that danged ole Nelson Mandella there man. Talkin bout that danged ole Winnie there man. You know what I'm sayin there man?
Lead Driver
Joined: Oct 2004
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From: Columbia, MO
Originally Posted by yeat
Danged ole Rotela 5 danged ole 40 Synthetic man. With a danged ole K&N Oil Filter there man. What ya using that danged Mobil 1 there man. That danged ole Mobil man, dont they support that danged ole Aparthied there man. Talkin bout that danged ole Nelson Mandella there man. Talkin bout that danged ole Winnie there man. You know what I'm sayin there man?
Senior User
Joined: Aug 2005
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From: Eastern Shore Md
Originally Posted by yeat
Danged ole Rotela 5 danged ole 40 Synthetic man. With a danged ole K&N Oil Filter there man. What ya using that danged Mobil 1 there man. That danged ole Mobil man, dont they support that danged ole Aparthied there man. Talkin bout that danged ole Nelson Mandella there man. Talkin bout that danged ole Winnie there man. You know what I'm sayin there man?
Lead Driver
Joined: Oct 2004
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From: Columbia, MO
Originally Posted by RushN350
I can't see $75 an oil change for rougher starts in the mornings.
What oil were you using? My starts, especially when cold outside, got a lot easier when I switched. Both the Rotella 5-40 and Mobil 5-40 gave easier starts.
Senior User
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From: Eastern Shore Md
Originally Posted by jtharvey
Rougher starts??? What oil were you using? My starts, especially when cold outside, got a lot easier when I switched. Both the Rotella 5-40 and Mobil 5-40 gave easier starts.
What oil were you using? My starts, especially when cold outside, got a lot easier when I switched. Both the Rotella 5-40 and Mobil 5-40 gave easier starts.
Lead Driver
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From: Columbia, MO
Originally Posted by RushN350
Rotella 5w-40. It still starts OK but it shakes and "romps" for alittle bit before settling to idle RPMs, Which is fine but... it never did that with plain old Castrol 15-40.
Posting Guru
Joined: Jan 2006
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From: Elkhorn, WI
synthetic oil should not give you rougher starts. it is thinner so it acts like dino oil that is warmer getting to all the engine parts faster on a cold day. i doubt it makes any difference in warm weather but it should start easier in the cold