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Sometimes if I'm feeling frisky I'll fill 3.5 quarts of the white bottle red cap Castrol GTX 20W-50 and then top off the last quart with a bottle of Castrol GTX High Mileage 20W-50.
Walmart sells the oil SOOO cheap, its like $10.17 for a gallon (which is approx. 5 qts)
What can be done to get rid of the "sewing machine" sound of a stock M20 and give it more of a smooth purr sound?
-Evan
Pull it out and put in something else?
An M20 is always going to be noisy due to its design. As the others have pointed out, oil and valve adjustments do help, and you should keep up on those even if they didn't help for obvious reasons.
The current fleet:
1992 325ic: 148k-171k miles
1999 Chevrolet Tahoe LT 4WD, 114k-142k miles
1984 MasterCraft Stars and Stripes Powerslot (not a car :D) PCM Ford 351W, 904 hours
Elf motor oil from Germany does an excellent job of quieting down noisy valvetrains (so I hear), but it's super expensive and I haven't forked over the $ to try it. I have been using Mobil 1 15w-50 for a long time and my valves are pretty damn noisy, even with a valve adjust 4 weeks ago :( Maybe I will try that GTX 20w50 high mileage next time.
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