Which one? Volvo or Freightliner

most ppl changing to full synthetic will see more oil use for the 1st 20-50k then it will go back to what it was.... thats what i've been told anyway

 

Actually, you can mix, go back and forth from full to semi synthetic, to regular all you want. I've been using Full Synthetic since I got my truck in 09. I have seen no change in consumption. When I started with royal purple @ 280,000 and even to this day I only use 1 gallon make up oil in every 30,000 miles. I never buy oil at a truck stop, I never buy oil that I can get in a truck stop. the reason behind this is if you look at the advertisements " This oil is the best selling oil in truck stops." just think, why would one oil be a better seller at a truck stop. How many people out there driving trucks know what would make a good oil? my guess is that it's the cheapest oil you can buy. I mean really. with all the corruption in this business don't you think that some one has figured out. If I make a cheap oil they will buy it?

I'm using what has worked for me. I had a 91 Chevy in Florida, it was around 100 deg outside. I changed the motor oil, transfer case, rear axle and front axle all in the same day. I didn't really notice a difference. the next day I changed the transmission fluid, on the following day on my way to work I noticed the engine temperature gage moving up and down from 180 to 190. it was normally around 210 at that time of year and in rush hour traffic. I finally got it the gage was reflecting the thermostat opening and closing with the difference in the friction in the engine and trans mission. if just using a synthetic oil was able to drop the water temp that much how much less friction was my truck generating now. I've been using it ever since.