Attention: TDR Forum Junkies Which weight
I came up on my first the other day and did much deliberating over the weight to use. I gathered all the information about Amsoil and am sold on it, but not sold on the idea of having to plan an oil change a long way out and order it in the mail. Call it a need for instant gratification of going to the store and buying oil and putting it in my Dodge the same day. I found Royal Purple at my local Napa and decided to try it based off all the glowing praise I always hear about it when asking around. I went with 75w-90. I live in Southern California and tow a 33' toybox. I may live in a warm climate now but was thinking about those trips up to the Sierra's when it gets winter time. My thinking is that if I had the best of both worlds I would be able to throw a switch and have 85w-140 when going to Glamis in the the heat, but have the thinner oil when it gets colder. I don't drive like a madman and don't feel the need to pull hills at 1200 egt's, so I believe that the thinner oil will suffice. Stock there is 90 weight in there and that seems to do fine for people (there are many out there that don't even know that there is such a thing as differential oil that do fine) on a regular basis, then the synthetic 75w-90 will be just fine. From what I have experienced vehicle longevity has more to do with how you drive it. You can't just put synthetics in there to make you feel better about thrashing your truck, you have to use synthetics and then be respectful by not driving like you just robbed a bank. I did put the Mopar friction modifier in my Dana 70. The manual calls for 6% of the fluid in the rear to be friction modifier. I used 3 quarts, 20 ounces. That turns out to be 6. 96 ounces of modifier. I just gave her the other 1 ounce for good measure. I also filled it up to 1/4 inch below the fill hole. So there you have it. It is done and over. I'm not going to think about it anymore. If it blows it blows. In my quest for synthetics for the engine I went to Cummins and they have Premium Blue Extreme 5w-40 full synthetic. It was cheaper and easier to obtain than Amsoil and is blended (made) by Valvoline for Cummins. I went on Cummins recommendations with this one. They seem to know what they are doing and don't have to prove anything to me anymore (this is my second Dodge Cummins). I noticed approximately 125 degree cooler egt's instantly. Previously I was using 15w-40 Premium Blue for break in miles. I will post later on whether or not I am getting better fuel consumption rates with synthetics.
I came up on my first the other day and did much deliberating over the weight to use. I gathered all the information about Amsoil and am sold on it, but not sold on the idea of having to plan an oil change a long way out and order it in the mail. Call it a need for instant gratification of going to the store and buying oil and putting it in my Dodge the same day. I found Royal Purple at my local Napa and decided to try it based off all the glowing praise I always hear about it when asking around. I went with 75w-90. I live in Southern California and tow a 33' toybox. I may live in a warm climate now but was thinking about those trips up to the Sierra's when it gets winter time. My thinking is that if I had the best of both worlds I would be able to throw a switch and have 85w-140 when going to Glamis in the the heat, but have the thinner oil when it gets colder. I don't drive like a madman and don't feel the need to pull hills at 1200 egt's, so I believe that the thinner oil will suffice. Stock there is 90 weight in there and that seems to do fine for people (there are many out there that don't even know that there is such a thing as differential oil that do fine) on a regular basis, then the synthetic 75w-90 will be just fine. From what I have experienced vehicle longevity has more to do with how you drive it. You can't just put synthetics in there to make you feel better about thrashing your truck, you have to use synthetics and then be respectful by not driving like you just robbed a bank. I did put the Mopar friction modifier in my Dana 70. The manual calls for 6% of the fluid in the rear to be friction modifier. I used 3 quarts, 20 ounces. That turns out to be 6. 96 ounces of modifier. I just gave her the other 1 ounce for good measure. I also filled it up to 1/4 inch below the fill hole. So there you have it. It is done and over. I'm not going to think about it anymore. If it blows it blows. In my quest for synthetics for the engine I went to Cummins and they have Premium Blue Extreme 5w-40 full synthetic. It was cheaper and easier to obtain than Amsoil and is blended (made) by Valvoline for Cummins. I went on Cummins recommendations with this one. They seem to know what they are doing and don't have to prove anything to me anymore (this is my second Dodge Cummins). I noticed approximately 125 degree cooler egt's instantly. Previously I was using 15w-40 Premium Blue for break in miles. I will post later on whether or not I am getting better fuel consumption rates with synthetics.
