Last year I purchased a 2001 Infiniti QX4 (engine: V6 VQ35DE) with 125,000 miles. I believe the engine was not properly taken care of regularly and would like to clean it safely the best I can. I changed the oil from whatever was in there to Mobil 1 High Mileage 5W-30 FULL Synthetic with FRAM ToughGuard filter and ran it for 1500 miles. At 126,500 I changed the oil again with the same FULL Synthetic oil and filter. Now 3,000 miles later at 129,500 I just changed the oil again.
The question is: Should I switch back to Conventional (Mobil 1 5w-30 conventional) on the next few changes while using MMO? How many changes with MMO should I use before I can revert back to my Mobil 1 5w-30 High Mileage Synthetic? I plan on using 20% MMO in the crankcase? Would this be considered too aggressive?
Any thoughts on this would be helpful. I'm 99% sure I'm overthinking and should just do it already.
The main things i want to accomplish:
1) Clean-up any neglect as I don't have service records and suspect little maintenance
2) Fix a random rattle at cold start-ups. Believe this is tied to lack of oil pressure in the timing chain tensioner which could be result of sludge/build-up
Also, I purchased an older Honda Civic 1991 and plan on doing something similar. It is extremely low mileage for it's age (124,000 miles) and I want to clean up anything that might have resulted with it sitting for long and rarely being driven.
Thank you!
The question is: Should I switch back to Conventional (Mobil 1 5w-30 conventional) on the next few changes while using MMO? How many changes with MMO should I use before I can revert back to my Mobil 1 5w-30 High Mileage Synthetic? I plan on using 20% MMO in the crankcase? Would this be considered too aggressive?
Any thoughts on this would be helpful. I'm 99% sure I'm overthinking and should just do it already.
The main things i want to accomplish:
1) Clean-up any neglect as I don't have service records and suspect little maintenance
2) Fix a random rattle at cold start-ups. Believe this is tied to lack of oil pressure in the timing chain tensioner which could be result of sludge/build-up
Also, I purchased an older Honda Civic 1991 and plan on doing something similar. It is extremely low mileage for it's age (124,000 miles) and I want to clean up anything that might have resulted with it sitting for long and rarely being driven.
Thank you!
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