How long to leave in M1 EP with a Wix Filter

[TomJones76]

Well, I'd say that towing regime places you somewhere between "regular duty" and "severe service".
My personal suggestion is to run that oil to the place where the OLM says to change it. When the OLM says to change it, sample the oil, reset the monitor and then follow the advice of lab.
Order a service with TBN, and note on your slip that you haven't changed this lube yet. You'll get appropriate advice, and you'll get it within a week or two of mailing off the sample. Sometimes much quicker... Blackstone called me the same day they got my sample to warn me of possible anti-freeze contamination in my Chevy.
Oh yeah.. out of curiosity, is that a hilly tow?
What speeds do you run? How long is the trip?
Strongly consider sampling your ATF due to the towing.

 

[Turk]

TJ: Not a hilly tow, trip is about 3-4 hours each way, run at 72-75 MPH (shhh...)

More info: '03 GMC 70k miles, never changed the tranny, xfer case or limited slip rear end oil.

I WILL change those with in a week at GM (deal of $260 for all 3 vs list price of $360) - know them well.... Synthetic in xfer & rearend, regular ATF in Tranny...

Or should I use something else...?

 

[Turk]

PS: The reason why I haven't changed the xfer, tranny & rear oil is the service advisors said there is absolutely no reason to change them yet - even with the towing & hauling I do.

They say 3,000 Lb towing is no big deal for it at all.

I think I need to get all 3 changed...! (?)

 

[D .Ram]

I have m 1 ep in now with 8000 miles on the oil .I plan on going 12000 & having oil tested . I changed the filter at 7000 miles

 

[ex_MGB]

quote:

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Ex - Do you change the filter in between the 15k oil changes...?

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No filter change. I use OEM filters. Filter changes would ruin the whole purpose, I'd much rather just change the oil than get at the filters on my Honda Accord and two Mazdas.

 

[NewGuy]

I just ran M1 EP 10W30 in my 2005 5.3L for 7500 miles. I wouldn't worry about running the Wix out to 10K miles. I have M1 EP 5W30 in right now and I plan to take it out to 10K miles.

The EP oils seem to run well in these GM engines. Much better than the standard M1.

 

[Rhymingmechanic]

I put 7200 miles on regular, pre-EP Mobil 1 5w30 and AC Delco filter in my 5.3. UOA came back with 4.5 TBN and wear compared well to averages for those engines. No towing, but the oil got lots of mountain driving and winter short trips.

I changed trans fluid with Mobil 1 at 35k. Shifts felt crisper afterward, and I noticed the same effect after another change at 50k.

 

[Turk]

I just bought 6 Qts of M1 ATF to change soon. Up to $2.50/Qt. cheaper than Amsoil...

 

[Screwdriver]

So, would running 12,000 miles on Mobil 1 EP Oil AND MB1 EP Filter seem too much for a 2.0L 4 Banger with 70% highway driving? Can I push it more?

 

[Turk]

I have ~200 miles on the M1 EP and it runs great with ne cold hi-rev lifter noise like I heard with the GM Dino oil !!!

 

[Dominic]

You do, on that GMC, need to check your rear gear level and if nothing else top it off. They always come low from the factory (I saw this day in and day out at a chevy dealership when I worked for one as a mechanic)

 

[Turk]

Thanks Dominic. I'm going to change it out to M1 synthetic soon.