YukonLover
TYF Newbie
- Joined
- Nov 20, 2024
- Posts
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Hi everyone,
I know oil pressure seems like a common question. But, what I don't understand is the constant variations; especially when there is void of any precursor. I have a 2003 4x4 with a 5.3. I replaced the pump, timing equipment, and pick up tube, gaskets ect. And it ran 35-40 PSI cold or hot idle, and around 45-55 under load. This truck had around 224k.
I have another 2001 2 wheel drive, and when I got it, it idled around 30 PSI cold, and 25-30 hot, and under load 39 PSI. I have been delivering for a company packages 3x a week for several weeks, the truck has been running 8-12 hour days, 80 miles a day and idling with limited start and stops. The oil, when cooled and dropped to the pan is a bit tacky, but not dirty. I maybe burned off at most half a quart since I changed the oil about 1500-1800 miles ago. Just last night my oil PSI seemed to be warm fighting 20-25 PSI sometimes not going past 20-22 PSI, and under load various pressures between 32-39 PSI approximately. Noticing a drop here.
I am getting ready to change the oil, and I did some research and shows that Royal Purple HPS has the most zinc at 1275, most oils are more more than 950. Apparently RP is not API standard, so they can add whatever they want, and their film strength is also superior, as I have seen in several test videos. Im looking for a bit more zinc and some extra film strength to keep it going longer. I was hoping to increase some pressure by having a thicker oil. I was thinking of adding some lucas to my current oil brand. But then I seen the natural lucas thickness, and I said what if I just use that and increased to 5w40 instead of 5w30? I heard a lot of people allege lucas made their bearing tolerances worse, so it improved temporarily, but just made the inevitable happen with just straight weight oil. I ahve been using Valvoline MAXlife high mileage for over a decade, but I feel in this engine maybe its not appropriate.
My plan was to use RP 5w40 and a good quality filter, possible replace the oil sending unit. And then say in 1,000 miles run some marvel mystery through it for another 500 miles, and then do a complete straight RP 5w40 swap until I have to change the pump out. Sound like a good idea?
I know oil pressure seems like a common question. But, what I don't understand is the constant variations; especially when there is void of any precursor. I have a 2003 4x4 with a 5.3. I replaced the pump, timing equipment, and pick up tube, gaskets ect. And it ran 35-40 PSI cold or hot idle, and around 45-55 under load. This truck had around 224k.
I have another 2001 2 wheel drive, and when I got it, it idled around 30 PSI cold, and 25-30 hot, and under load 39 PSI. I have been delivering for a company packages 3x a week for several weeks, the truck has been running 8-12 hour days, 80 miles a day and idling with limited start and stops. The oil, when cooled and dropped to the pan is a bit tacky, but not dirty. I maybe burned off at most half a quart since I changed the oil about 1500-1800 miles ago. Just last night my oil PSI seemed to be warm fighting 20-25 PSI sometimes not going past 20-22 PSI, and under load various pressures between 32-39 PSI approximately. Noticing a drop here.
I am getting ready to change the oil, and I did some research and shows that Royal Purple HPS has the most zinc at 1275, most oils are more more than 950. Apparently RP is not API standard, so they can add whatever they want, and their film strength is also superior, as I have seen in several test videos. Im looking for a bit more zinc and some extra film strength to keep it going longer. I was hoping to increase some pressure by having a thicker oil. I was thinking of adding some lucas to my current oil brand. But then I seen the natural lucas thickness, and I said what if I just use that and increased to 5w40 instead of 5w30? I heard a lot of people allege lucas made their bearing tolerances worse, so it improved temporarily, but just made the inevitable happen with just straight weight oil. I ahve been using Valvoline MAXlife high mileage for over a decade, but I feel in this engine maybe its not appropriate.
My plan was to use RP 5w40 and a good quality filter, possible replace the oil sending unit. And then say in 1,000 miles run some marvel mystery through it for another 500 miles, and then do a complete straight RP 5w40 swap until I have to change the pump out. Sound like a good idea?
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