How long of an OCI should I go?

[Lyman]

Im running 5k OCIs on my 97 Mustang GT 4.6. 155,000 miles and no issues at all. I know these engines are pretty easy on oil. Im running PP 5w30 right now and it's at 5k now. I have my next OC of QSUD 5w30 sitting on my work bench ready. Couldn't pass up the rebates. So without doing a UOA how far would you guys run it? Oh and 95% of my driving is freeway 65mph 17miles one way to work.

 

[Jason8691]

Keep going with what you're doing, it seems to be working.

 

[Malo83]

5K is my routine

 

[345hemi]

i go 6000-7000 i use Mobil 1 or Valvoline Synpower/ NAPA synthetic. you should be good or if 5000 works for you and makes you feel comfortable I'd stick with that.

 

[Donald]

I believe you could go 7500 unless you know there are problems or go a lot of short trips. PP is very good oil.

 

[MuzzleFlash40]

Go with what keeps you in YOUR comfort zone. Thats what keeps some people doing 3k oil changes. 5k is my limit no matter what oil I use. Kepp doing what your doing that pony will last another 155k.

 

[tig1]

I do 10K with M1 oils.

 

[Lyman]

Well I changed the oil out today. Along with a new air cleaner and PCV. I will stick with the OCI I have been using. Thanks for all the replies.

 

[jim302]

95% highway (assuming no stop & go) on an engine with no mechanical issues should be fine for 7,500 miles, especially since you're using a high quality synthetic. A UOA would be a good idea before pushing it further.

7,500 miles has been the official spec for normal service for quite some time in a lot of cars, and this generally assumes dino oil. Your driving situation definitely sounds like normal (not severe) service.

 

[A_Harman]

I think you could go 7500 miles for an OCI.