I am a bit lazy
I switch my 1998 Suburban(bought 2007 with 195,000 $2950-now has 228,000 runs great) to Mobil 1 as soon as I bought it
Used 5w30-but after a couple of years I switched to 10w30 Mobil 1
I did it because It had "slightly lower oil pressure" 17 psi-than I "liked"
I'm in a HOT climate-New Orleans
In made no MPG difference that I could measure-and no real reason to switch- 17 psi IS PLENTY
But it also has an oil leak-probably at oil pan-plastic timing cover junction
so heavier weight will probably leak slower when the motor is off
Anyway I now use the extended service 15,000 mile oil-change it once a year-but a year is just 3500 miles
So it probably wouldn't hurt to go 10w30-but you don't need to-GM calls for 5w30-they probably know what they are doing
Yeah 97000 miles is NOTHING for a modern engine-they shouldn't break before 200,000 miles
I switch my 1998 Suburban(bought 2007 with 195,000 $2950-now has 228,000 runs great) to Mobil 1 as soon as I bought it
Used 5w30-but after a couple of years I switched to 10w30 Mobil 1
I did it because It had "slightly lower oil pressure" 17 psi-than I "liked"
I'm in a HOT climate-New Orleans
In made no MPG difference that I could measure-and no real reason to switch- 17 psi IS PLENTY
But it also has an oil leak-probably at oil pan-plastic timing cover junction
so heavier weight will probably leak slower when the motor is off
Anyway I now use the extended service 15,000 mile oil-change it once a year-but a year is just 3500 miles
So it probably wouldn't hurt to go 10w30-but you don't need to-GM calls for 5w30-they probably know what they are doing
Yeah 97000 miles is NOTHING for a modern engine-they shouldn't break before 200,000 miles
