From M1 HM to PU for Cleaning?

[lukejo]

Originally Posted By: lukejo
Originally Posted By: geeman789
You could run a hdeo (diesel) oil for a change or two... a little more cleaning power...but I would keep the intervals shortish.

Rotella T-triple makes a 10w30 conventional that would probably work well in summer.


Hmmm. Never thought of that. No down-side to trying if I keep the OCI short?

Rotella T5 syn-blend in 10w30 states it is for gasoline engines too, so as long as I didn't use it long enough to "undo" the HM seals, I guess it would be just fine.

 

[Nick1994]

Originally Posted By: lukejo
Originally Posted By: Nick1994
Originally Posted By: lukejo
Originally Posted By: Nick1994
Do your Camry's have the 2.2L or 3.0L?

My 2.2L Camry has a baffle (or whatever you call it) under the valve cover and you can't see what's going on in there just from the oil cap. If it's the 2.2L change the valve cover gasket just for the heck of it, it's super easy and get a good look.



2.2L --- Yep, my '97 has that baffle, but I can still see with a light and head at the right angle. This car, the "new" '95 has no baffle..easy to see.


Those 2.2L's sure are power houses aren't they?

I tell you, with as many miles as I drive for work, that's probably the big reason I don't have more tickets. But then again, you get over 300k on the suspension/etc. and you get a little uptight hurdling down the road over 65 mph.


What kind of mileage do you get? I get about 22-24 commuting around with traffic and a little but of highway, but pure highway is in the low 30's.

Best tank was 36.72 mpg

Mines an automatic, what about yours?

 

[lukejo]

quote]

What kind of mileage do you get? I get about 22-24 commuting around with traffic and a little but of highway, but pure highway is in the low 30's.

Best tank was 36.72 mpg

Mines an automatic, what about yours?[/quote]

Both are automatics. Yeah, I get similar. I noticed that mpg is really sensitive to tire pressure. More so than other cars we've had?

 

[virginoil]

Originally Posted By: CapitalTruck
If the vehicle has had high mileage oil used for a significant amount of time I believe the seals become expanded because of the seal sweller that HM oils use. After the use of these products is discontinued oil consumption can go up. That would be my worry for you. I probably would just keep up with the HM oil.


I would agree with the above comment after 50,000 miles on M1 HM oils keep using the same oil and grade.

If you try to clean up the engine you will clean up other things as well and the seals may not be pliable enough at its AGE to accommodate shrinkage and swelling change resulting in further leaks and weeps.

 

[Nick1994]

Originally Posted By: lukejo
Quote:


What kind of mileage do you get? I get about 22-24 commuting around with traffic and a little but of highway, but pure highway is in the low 30's.

Best tank was 36.72 mpg

Mines an automatic, what about yours?


Both are automatics. Yeah, I get similar. I noticed that mpg is really sensitive to tire pressure. More so than other cars we've had?


Hmm I've never played with the tire pressure much, my best tank was round trip about 60 mph, windows up, no A/C, and being very gentle with the gas pedal. There was quite a bit of hills going up but downhill back down. I'll have to wait til winter to try to beat that record, too hot to not have the A/C on but I'll definitely try to pump them up!

 

[lukejo]

Went ahead and did OC today, giving T5 Rotella 10w30 a try. OEM filter. Also changed the PCV. The old one seems to work, but sluggish, had lots of crud in it. I drained the M1 HM very hot and could see a really small amount of solids come out. So as some of you recommended, frequent OC's might be all that is needed....and M1 HM might do it. I'll do another short interval with this T5.

 

[SuzanneClerkin]

Originally Posted By: lukejo
I just acquired a 1995 Camry 4cyl with 170k. Previous one-owner used PYB for the first 120k, then switched to M1 HM for the last 50k. Under the oil fill cap I see some sludge. Not just varnish, but a thin coating of black sludge.
I assume it is due to one or possibly two things: while maintenance records are good (OCI every 4k since new), driving was almost always short-trip, in-town, sometimes months and months without getting on the highway. In combination, I'm not sure if PYB was any good 15-20 years ago under these short-trips driving habits.
Runs great. Burns no oil. Very, very small leak (maybe 2 drops per day and imperceptible on the stick).
Question--if it has had M1 HM for several years and I still see some sludge should I switch to PU for a while and see if clean-up occurs? Running as good as it does, I don't want to try an auto rx or similar treatment...but rather just try gentle cleaning through good oil. I guess my only hesitations in trying the PU....is why change if it won't clean any better, and concern over the seals if I leave the HM on this 20 year old engine. (only 10w30 since new) Thanks in advance for your thoughts..


Hi lukejo - This type of driving (short routes, with months between when the car saw the highway, etc.), indicates that the water and/or some of the bad combustion by-products were not really given a chance to “burn off” – and this “burn-off” happens when a car’s engine is allowed to get up to temperature for a certain amount of time. So, it appears that this engine was never really allowed to get up to operating temperature - or if it did, it wasn’t there for long. However, we would still recommend that you stay with a High Mileage product at this point in the engine’s life. The increased level of anti-wear protection, as well as the increased level of seal conditioner in the HM products are what this engine really needs (again, at this point in its life). With that said, we have Quaker State Defy 10W30 (a semi synthetic product) available for this application, which we feel would be good choice for this engine. - The Pennzoil Team