A lot of mechanics say you can go 10-12K easy on the newer cars between changes with synthetic.

 

Yep, and if I'm ever really pressed for money I might do that, but about 8,000 is as far as I usually go.

Well, if you are burning oil, that's one thing, but I have a vehicle with over 230,000 miles and sold one a while back that had over 200,000, both 1996 vehicles...I run/ran nothing but synthetic, so age and mileage have no bearing just in and of themselves on using synthetic or not. But yeah, if you are having to add a half quart every week or two, then might as well just use what gets you by I guess.

 

True, that and the daily commuter (290K) gets oil change every three months, dealer told me I didnt need to do it based on miles because I put so many on it. Just change it regular.

My car loses power after 5,000 miles of synthetic oil. Once I get it changed, it's ready to launch again.

My car loses power after 5,000 miles of synthetic oil. Once I get it changed, it's ready to launch again.

 

Your kidding right?

Had a mechanic tell me once it was all the same. :idunno:

I use mobile 1 full synthetic. I have thought about going to amsoil but I don't like changing my oil up if I've been using the same thing since I've owned the vehicle. I will probably migrate to amsoil after my next car purchase, which hopefully isn't anytime soon.

 

I had a Jeep Wrangler years ago that ran great but leaked oil when I used a 10w-30 mobile one synthetic in it. The jeep had a straight 6, which was built a bit like a diesel, so I gave Rotella a try. It was a heavier weight oil, but I asked my uncle if it would be okay to use it (he helps Valvoline formulate oils) and he said it would be fine. I never had to add oil to that Jeep again between oil changes and it had 275,000 miles on it when I sold it.

Had a mechanic tell me once it was all the same. :idunno:

 

It's not. If you change regularly and use the proper weight oil for the climate you can get by with using conventional oil though.

Is there any problem with switching to synthetic after the car has been used to regular oil (50,000+ miles)?

Your kidding right?

 

No, I do 3 oil changes a year at about 4500 miles. When I get near the 4500 mark, I lose considerable punching power.

Is there any problem with switching to synthetic after the car has been used to regular oil (50' date='000+ miles)?[/quote']

 

Nope, not unless you have a Mazda, some Mazdas don't respond well to synthetic.

Is there any problem with switching to synthetic after the car has been used to regular oil (50,000+ miles)?

 

I probably wouldn't switch over if your in the 100,000 plus range, but if your 100k or below I would make the switch asap.

No, I do 3 oil changes a year at about 4500 miles. When I get near the 4500 mark, I lose considerable punching power.

 

You must be driving a well oiled machine with extremely tight tolerances if you can notice a considerable difference in power.

Had a mechanic tell me once it was all the same. :idunno:

 

I had a couple tell me the same thing.

Had a mechanic tell me once it was all the same. :idunno:

 

Synthetic oil has mineral oil in it. But synthetic oil is lab created, conventional oil is mineral made.

I had a couple tell me the same thing.

 

Guy who was in Air Force in Alaska said they tested the heck out of oils a number of years ago and their nominal lifetime performance was similar due to all the additives added to the oils. They all performed the same under normal use. Syns age better and break down less. Hence why BMW requires you to use synthetic but says you can run 10,000 miles on it.

 

Non-synthetics should not go above 5 to 7K a most usually.

 

There is always the blend for those who just are sure but do not want to pay the full synthetic cost.