Is there any special time that you should have the valves adjusted on my 1995 12 valve? I change the oil every 5000 miles and the filter also. I am just trying to take care of my baby. Now It will sit out there In the garage this winter I hope the diesel fuel holds up. Is there a additive to add to the fuel? I never did add any additive. Here a picture of us getting ready for get together. A little brew don't hurt does It?