- Joined
- Jun 18, 2023
- Messages
- 5
hello from Northern ,Alberta ,im 79 yrs old retired small engine mechanic.
i have 05 GMC 1500 4x4 with 495,000 kms on it ( 300,000 miles,) got it original 85 yr old owner 3 months ago who Never changed the oil,changed filter and added new oil every 5000 kms.. it clicked when i first got it..so i bought a 5 gal pail of cheap chit 10-30 from Wally world..after 3 changes,,motor runs very quiet, but 20 lbs on oil pressure at idle..40 at highway speeds, should i use heavier oil and or additive.my HD mechanic friend recomends 15-40 in everything or add Lucas motor conditioner.. what do you think.?
i have 05 GMC 1500 4x4 with 495,000 kms on it ( 300,000 miles,) got it original 85 yr old owner 3 months ago who Never changed the oil,changed filter and added new oil every 5000 kms.. it clicked when i first got it..so i bought a 5 gal pail of cheap chit 10-30 from Wally world..after 3 changes,,motor runs very quiet, but 20 lbs on oil pressure at idle..40 at highway speeds, should i use heavier oil and or additive.my HD mechanic friend recomends 15-40 in everything or add Lucas motor conditioner.. what do you think.?