Just got a rebuilt long block in my xj and I want to make sure I'm doing everything I can to keep it clean and running smooth. I've done some reading on other threads and it seems like the general consensus is to run an oversized filter and oil with high zinc and phosphorous content such as high mileage or diesel oil. My question is what is the appropriate oversized filter and is it better to run conventional or synthetic? I am going for the best filtration, flow, and longevity of my engine not to concerned with price or miles between changes. I had previously used conventional 10w30 and a standard filter.
The FL-1A is the motorcraft number, Wix is 51515. Either one of those are good filters for the price. Conventional oil is just fine for these engines, most of the benefit to synthetic is for extended oil change intervals. Change the oil on time and keep it clean.
Valvoline vr1 10w30 is what im pretty sure im going to be running in my freshly remaned engine after break in, for break in I went with brad penn break in oil. and for the first few oil changes ill be running just a regular napa gold filter since ill be changing after the first 500 and then 3000 for a couple changes at least before I extend changes greater change intervals (like maby 5k).
99 Wrangler Sahara 5spd manual - Mine
08 Patriot sport 4x4 auto - Wifes
92 Cherokee Lorado auto - for when mine needs fixin/winter beater
Im sorry, some times i drink and post stupid comments.
Thanks, is it bad to run high mileage oil in a new engine?
I wouldn't use it for anything unless I was really trying to help an older engine. High mileage oils typically contain stop leak additives to soften or "condition" seals, they also tend to have more aggressive detergents to help dissolve sludge and build up from older engines.
Not that these oils are bad but I dont think there would be any benefit for you to run them on low miles or new engine.