I had oil analysis done before when it had been in 8k and they said it would have been good for 2k more. I always run 10w30 synthetic blend. Trucks at 64k now.Any of you doing the early oil changes having any of them analyzed by Blackstone? I’d be curious to know what the findings are? Personally I don’t think it’s the oil type or brand. If it’s due to lubrication I’d think it would be from lack of oil or poor oiling. Who knows?