Lifter noise only when startups below 50 degrees

[Merkava_4]

Originally Posted By: PalmSpringsSCal
For the last 20K miles I have been using 5-30 "high mileage" oil


That's your problem right there.

Mobil 1 Noise at BITOG

 

[ZeeOSix]

Originally Posted By: PalmSpringsSCal
Ive put a lightbulb next to lifter cover over night when nights are expected to be below 55 so and that does eliminate the start up lifter racket.

The light bulb is keeping the valve train warm, but it's really not doing anything to keep the oil in the sump warm. If you definately see a difference just due to the light bulb, then that's a hint to the root cause.

I'm thinking it's a mechanical clearance issue that's affected by temperature. Is the valve clearance adjustable on this dngine, or does it really have hydraulic components in the valve train to keep the proper clearance?

 

[PalmSpringsSCal]

I discussed this briefly with a mutsu forum and no one thought of your question. Ill have to find out.

 

[PalmSpringsSCal]

Well I used it for cold start up theory,but are you saying it retains less oil w/5 wt on parts after sitting than with the 10 -30 or 40 I had been using?

 

[Garak]

Originally Posted By: Virtus_Probi
Intelligent orange molecules?

My old Audi had a bit of it, but I suspect the previous owner simply used GTX PCMO for the 12,000 km severe service intervals.

 

[PalmSpringsSCal]

PUP? iSUZU DSL PUP? Still have my 81 since new

 

[PalmSpringsSCal]

I dont know exactly how Im occasionally replying to post incorrectly. Usually my replies follow the post I respond to but this and another one end up somewhere else and not following that thread. make sense?