I have been running Mobil 1 5W-30 in my 2002 Toyota Tacoma 4wd 3.4V6 since 11k miles. It now has 30k with pretty good analysis results.
I live in Northern Georgia where temps range from 0-100.
Questions:
1- Would this oil HARM my engine/ reduce engine life in ANY way?
2- Approx what kind of effect could I expect to see with this oil?
3- MOST IMPORTANTLY: Would this oil INCREASE my engine life/ help motor?
4- ANY ADVERSE things I should expect?
5- Do you recommend staying with Mobil 1 5W-30 or going to Delvac 1 5W-40?
Driving is about 60-70% highway 75-80mph.
THANKS