Originally Posted by Railrust
Originally Posted by A_Spruce
I've always used conventional oil and done OCIs at 3500 miles. I've now changed to Mobil One synth in a new-to-me '03 Suburban, manual says 3500 miles, OLM has yet to come on at nearly 4K miles, mechanic suggested 5k OCIs, and the fine folks here are suggesting 7500+ miles.
I think even with your tougher than usual drive/commuting habits, a synthetic oil should do ok with a 5k mile OCI, as long as you check your oil level and make sure it's topped up. That engine is not direct injected and should handle 5,000 mile intervals easily.
Thanks for your thoughts.
Originally Posted by A_Spruce
I've always used conventional oil and done OCIs at 3500 miles. I've now changed to Mobil One synth in a new-to-me '03 Suburban, manual says 3500 miles, OLM has yet to come on at nearly 4K miles, mechanic suggested 5k OCIs, and the fine folks here are suggesting 7500+ miles.
I think even with your tougher than usual drive/commuting habits, a synthetic oil should do ok with a 5k mile OCI, as long as you check your oil level and make sure it's topped up. That engine is not direct injected and should handle 5,000 mile intervals easily.
Thanks for your thoughts.