P38 Oil Question

[alpaca]

2002 4.6 HSE 

 

What do you guys run and how many miles between oil changes ? I'm thinking to go with Castrol GTX HM (semi syn) 10W40 .... doesn't get too cold around here .. 

[foster]

I forget what I put in my P38... I do whatever Jiffylube synthetic because they top it off for free between changes. This is a policy that will likely bankrupt my particular Jiffylube franchise. I do roughly 4,000 miles between changes.

[Elherbinator]

I use Mobil 1 high mileage synthetic 10w-40 in my D2. I go with the slightly heavier than average viscosity because when I drive it, I usually have it running for very long periods. As a trail rig, I am typically driving multiple hours to get to the trail and then have it running for many hours on trail. So the engine is usually hot and has relatively few cold starts per mike or hours run. So that was my strategy with switching from a 30 to 40 viscosity. The winter viscosity doesn’t need to be too low since it doesn’t really get too cold here and I only snow wheel it a few times a year max typically

 

 

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[kultur]

I use regular dino oil, 5w-30, always with a WIX oil filter. I usually change it every 3k

[Teds]

I use Dino oil. 15w 40 Delco from Costco. It's an old design without the tight tolerances in new engines requiring synthetic. Main thing is to change regularly. I used synthetic for a few years and then switched. I also run standard green coolant and no DexCool. 4.0/4.6 is 1960s technology pushrod engine.

[Teds]

I use Dino oil. 15w 40 Delco from Costco. It's an old design without the tight tolerances in new engines requiring synthetic. Main thing is to change regularly. I used synthetic for a few years and then switched. I also run standard green coolant and no DexCool. 4.0/4.6 is 1960s technology pushrod engine.

[lithium1330]

I run Mobil1 15w50.

It’s heavy weight, but synthetic runs even in cold.

That said, I use it bc of higher zinc content that’s typically recommended for these older rover engine designs.

That and these engines usually run hot and benefit from the 50 weight.

I buy these by the 5qt jugs when they have sale and rebates on them.

I think they work out to maybe $4/qt some times.

[alpaca]

Thanks for the replies guys - I went with the Castro’s gtx hm 10w40 - amd mann filter - seems to have Reduced the leaks from sump pan and oil cooler lines - and running fine so far .....