Trans­mis­sion oil change

Car Mechanics (UK) - - Help! -

I have a 2013 Jeep Grand Chero­kee with 30,000 miles. I change the en­gine oil twice a year and was won­der­ing if it would be a to­tal waste of time and money to change all trans­mis­sion oil at this mileage, as I wish to keep the ve­hi­cle in best pos­si­ble con­di­tion.

Also, could you give me any in­for­ma­tion on fric­tion mod­i­fiers for fu­ture ref­er­ence? Ray Brad­ford

You do not men­tion which en­gine you have in your Jeep, so I am mak­ing the as­sump­tion it is the more com­mon 3.0 unit. The rec­om­mended change in­ter­val for the diff and trans­fer box oils is 50,000 miles, while the au­to­matic trans­mis­sion oil in­ter­val is 62,500 miles. Gear­box and trans­mis­sion oil on four-wheel drive ve­hi­cles does take a ham­mer­ing, so chang­ing them at 30,000 miles would pro­long the life of the com­po­nents.

Re­gard­ing fric­tion mod­i­fiers, I am as­sum­ing that you are con­sid­er­ing this for your Jeep. There are such a wide range of fric­tion mod­i­fiers that it would be im­pos­si­ble to list all of the op­tions here. In gen­eral, mod­ern ve­hi­cles have been de­signed to use spe­cific oils and mod­ern syn­thetic oils do a very good job, so most man­u­fac­tur­ers ad­vise that fric­tion mod­i­fiers should not be used in their ve­hi­cles – this is es­pe­cially true if a lim­ited slip dif­fer­en­tial is fit­ted.

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