I just started using synthetic Mobil 1 in my 04 Jeep Grand Cherokee.It has made a big difference.It's allot quieter and I picked up two more miles per gallon.not to mention now I can go 7500 between oil changes instead of 3000.
I just started using synthetic Mobil 1 in my 04 Jeep Grand Cherokee.It has made a big difference.It's allot quieter and I picked up two more miles per gallon.not to mention now I can go 7500 between oil changes instead of 3000.
Funny enough, I just made the same change to my wife's '05 Grand Cherokee. I haven't noticed any difference in fuel mileage. It does run smoother, but I attribute that to the fact that I changed the spark plugs at the same time. Like you, I basically did it so I would feel better about going 6k between changes.
I ran synthetic for awhile in the new (rebuilt) engine in my thunderbird.
Never noticed a difference in mileage, oil temps, or anything else that mattered. Haven't run it in a year or so now. Dunno if I'll switch back or not.
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I've been running Mobil1 full synthetic for 14 years now. I don't use it in my '88 as she uses a quart between changes. I have used it in every new car I've purchased since 1995. I change the oil every 12k miles or once a year and the filter at the 6k mile point. My engines have remained quiet, no leaks yet and run strong. I can't say that I'm getting any better mpg or have more power but I'm very satisfied.
In fact, I changed the oil in my Taurus this morning. The last time was last July. She had 11,786 miles on the oil. The engine now has 105k and she's a screamer still.
There are a variety of opinions on this site concerning syn vs. dino oils. The motorcraft oil is semi syn for those that want the protection but still feel comfortable with 5k changes.
Tim
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I've been running Mobil1 full synthetic for 14 years now. I don't use it in my '88 as she uses a quart between changes. I have used it in every new car I've purchased since 1995. I change the oil every 12k miles or once a year and the filter at the 6k mile point. My engines have remained quiet, no leaks yet and run strong. I can't say that I'm getting any better mpg or have more power but I'm very satisfied.
In fact, I changed the oil in my Taurus this morning. The last time was last July. She had 11,786 miles on the oil. The engine now has 105k and she's a screamer still.
There are a variety of opinions on this site concerning syn vs. dino oils. The motorcraft oil is semi syn for those that want the protection but still feel comfortable with 5k changes.
Tim
Tim, are you using the Extended Performance, or the standard Mobil 1? Just curious, because they advertise the EP as being good for 15k.
Tim, are you using the Extended Performance, or the standard Mobil 1? Just curious, because they advertise the EP as being good for 15k.
I use the EP but still change at 12k. Even before the EP came out, I was still changing at 12K. I think the EP is a marketing gimic and it costs about $4.00 more per 4.73L bottle in Walmart.
I orginally got turn on to this when I found out that Coast Guard air crews was using Mobil1 full syn in thier helocopters. I don't know if they still do. I've been retired for 5 years.
Tim
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I run a special 50wt synthetic in the transmissions of both my trucks, but I can't justify it for the engines. I know it doesn't have the zinc for my 360, I run 15w40 diesel oil in that one. I run regular 10w30 in my Courier 2.3, and a Motorcraft FL1A. Dump the oil at 3000ish, and run the filter 8-12k. It burns and leaks, so I'm not wasting my money on synthetic.
The Subaru might get synthetic again if I find an EJ22T for it, but now that it's going to be non-turbo, it gets Castrol GTX 10w30.
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The next time I rebuild a engine, I will start it out on synthetic and see how it does.(after break-in)...........I have heard of leakage issues with switching from conv. to syn. oils in older engines, but have no personal knowledge of it.
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The next time I rebuild a engine, I will start it out on synthetic and see how it does.(after break-in)...........I have heard of leakage issues with switching from conv. to syn. oils in older engines, but have no personal knowledge of it.
I have heard this too,so I'll let you know LOL
Not sure if it's just a rumor or not. I did the Mobil 1 full synthetic for high mileage engines in the Jeep. We all know how well Jeeps retain their oil.
I'll probably switch the oil over in the mustang too.
I orginally got turn on to this when I found out that Coast Guard air crews was using Mobil1 full syn in thier helocopters. I don't know if they still do. I've been retired for 5 years.
Tim
All gas turbine engines and especially aviation turbines use synthetic lubricant. They use roller bearings on the shafts which are prone to damage if there's any coking of the oil. Synthetics are more resistant to coking from the high temps generated in a gas turbine. I'm fairly certain the USCG ground crews didn't use an automotive lubricant like Mobile 1. But instead an aviation certified lubricant like Mobile Jet II.
I've used Pennzoil Platinum in my Taurus commuter mules. I never noticed and difference between that and the Motorcraft semisynthetic I used before: same noises, same mileage. The benefit to me is I can run the PP for 10k versus 5k on the Motorcraft. That's a big help since I put about 1k per week on them.
In the Bronco's 302 I've run WalMart semisynthetic, Motorcraft semisynthetic, Pennzoil Platinum and Rotella conventional. The best by far is the Rotella but I run Motorcraft 5w20 in the winter to help on those -25F mornings. I didn't really notice a difference among the rest. The PO left quite a mess from poor maintenance and the Rotella has done a good job slowly mopping up the gunk that had accumulated.
Unless you plan on extending your change intervals I doubt anyone here is going to get much use out of synthetics. It's like buying a 50ft extension latter to paint a one-story house. It won't hurt anything but you really aren't getting anything for the extra expense since you aren't calling on it to do the extra things it is capable of: extreme cold starts, turbo-charger cooling, extended change intervals.
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