Synthetic Oil Users

[MK]

I use Castrol synth blend in my car. Change it and the filter every
5000 miles when the blinky light starts winking.
My trucks, I use regular dino oil.. I'm not as picky about those.

I use it in the car to reduce jelling, which had been a problem on
certain Toyotas. The heads on my year car supposedly have wider oil
passages to reduce the coking/jelling problem, and I use the synth
blend as added insurance.

 

[Jswiney9]

i live in the coal fields. I drive a subaru forrester and my first ooil change was recommended at 7500 miles. it took me 14 months to hit that............ the oil looked brand new. the filter wasnt horrible either.not sure what oil they start with but its a 0 weight oil. I replaced it with a purolator filter and castrol which are my go to products. it absolutely bewilders me that people refuse to use the newer synthetics

 

[Squarebutt]

I've tried synthetic in several vehicles with no noticeable improvement in MPG's or performance. One pickup truck actually needed oil between changes, probably because the thinner syn slipped past the rings. I get 200,000 miles out of our vehicles on dino oil, and by then the salted winter roads have done their damage.
A petroleum engineer told us that syn is really worthwhile on air-cooled small engines, as it flows better through the small passages and the oil also works as a coolant. I use it in the old John Deere garden tractor, the snowblower, generator and power washer.

 

[icemn]

10k miles and no regard for time, but generally gets done within 12 months. Either use a Mobil 1 or purolator pure one filter with Mobil one oil. No issues for several hundreds of thousands of miles.

 

[max]

As long as my Lincoln is under warranty, Ford pays for the oil changes and they use a Motorcraft synthetic blend. The first change for me was 9 months and 5k miles after purchase. The computer said my % was down in the teens.

 

[Philadelphia Patriot]

I got my SUV with 73,000 miles on it. It currently has 118,500 miles on it. I change my oil every 3,000-4,000 miles. I use Castrol GTX High Mileage Synthetic Oil. I also use a high mileage oil filter. I do primarily city driving so I spend a lot of time idling my engine at red lights.

 

[CoMF]

German Castrol 0W30 at the Subaru recommended 7k mile intervals. I probably could stretch it a little further depending on what a UOA revealed, but it's been working fine for me for the last 5 years or so.

 

[THEWELSHM]

I change my Dodge truck at 6000 miles with Mobil 1. The wife Mercedes every 10000 and the dealer calls for 12k?? Either way we get good motor life with synthetic.


thewelshm

 

[DWFAN]

Mobile One 0-40 in my 88 Seville once a year, in the fall. Regardless of the mileage. Just bought an 89 STS and that will get the same treatment. The paints going to fall off before the engine goes south.
DW

 

[EugeneNine]

Mine has the oil life monitor which tells me around 6000 miles. I rotate the tires at the same time.

 

[SMSgt]

I change the High-Milage synthetic every 5000 miles in both my vehicles; one with 160000 miles on it, the other with 260000 miles. other than some slight valve cover leakage on one from a valve cover gasket, neither have oil-related problems.

I picked 5000 miles as it was easy to keep track of when to change.

I previously owned a '80 Corrola that I switched to Mobil One at 10000 miles. The gas mileage went from 28 to 32 MPG and the engine ran noticeably cooler. My wife, who thinks warning lights and coolant running out means try to make it home instead of stopping, drove it until the engine stopped a block from the house. I fixed the leak, filled the radiator, changed the oil and drove it another 25000 miles until the engine crapped out.

I was sold on it from then on.

 

[Engineer1911]

2012 Colorado and 2009 HHR get Mobil 1 5W-20 oil changed every 20K miles. Oil filter changed every 5K miles with WIX premium oil filter. I watch the oil level and add a little to keep oil at the FULL mark all the time.

HHR has 75K with no performance issues, Colorado has 50K and running fine. Followed same change routine on 1995 S10, 1984 Olds Cutlass, and Pontiac 2001 Grand AM GT that all had over 130K miles without engine problems. Just got tired of fixing electrical problems related to age.

 

[carpriver]

I have a 2013 F-150 5.0 with a heavy duty towing package, we tow a 5th wheel. I use either Mobil 1 or Ford synthic oil and change the oil at the start of summer and at the end of summer. If we go south during the winter and We put 7000 miles on it I will have it changed.

 

[CoMF]

Shoot... Forgot to say I use the Subaru factory oil filters with my 7k GC oil changes.

Yeah, it's a glorified FRAM, but Subaru specs a pretty high relief valve opening pressure (22 PSI, IIRC) that's almost impossible to find in the aftermarket filters. Plus they use that "P" shaped molded gasket that doesn't leak.