Jeep Wrangler :: 87,000 mi

[ARMY_Guy]

Hello friends, long time. Those miles are adding up on my beloved Wrangler and I need your advice once more. I have a K&N air filter and the intake kit on it, and am def. running it hard off the line in my Central Jersey home.

Jeep 4.0 X
87,000
I drive rough.
I use any gas available since the summer 'fuel crisis', but usually fill up on Exxon/Mobil.
The normal oci is 4,000-5,000 miles.
unfortunately I went to my favorite FireStone with little time and had the Kendal GT-1 synthetic, and a quart of Mystery Marvel put in it, but have used Mobil 1 and 1 qt. of Mystery Marvel the past 3 times.

Question:
1) What do you recommend I use this weekend, during the drain?
2) Engine flush, or no?

ps: I have 2 qts. of Castrol 5-50 I picked up at the local PX and a Fram Extra Guard filter I'd like to utilize.

Thanks.

ARMY Guy

 

[rg200amp]

I would say no to the flush. All that Marvel should have cleaned things up. I would cut the Marvel out, and stick to a quality synthetic oil like Mobil 1, Pennzoil Platnium, Synpower, Royal purple, Ect. . .
And keep the OCI low 4000-5000 miles.


I would not use 5w50. I used to stick to 5w30 or 10w30 in my 4.0.

 

[HTSS_TR]

If you already have Castrol 5W50 and want to use it, you should get Castrol 5W20 and mix with 5W50 to thin it down to W30 for your Jeep.

 

[Texas Aggie]

With a low OCI, I wouldn't think a synthetic would be necessary.

 

[ARMY_Guy]

Thanks guys.

-ARMY Guy