Oil change & gear lube underfilled?

[RHOfan]

Prepping for my 1st oil change, so tried to find an RHO oil change video on YouTube. None. But, a few on TRX. Interesting, the Hellcat has an oil cooler that also has a drain plug. Wondering about the RHO…anyone know if the engine in RHO has a separate oil cooler with its own drain?

Also, watched a few gear lube videos & two mentioned the front diff takes 1.5qts, but 99% of TRXs have only 1qt installed at the factory. Has anyone checked this on their RHO? Same for the transfer case…1/2qt low is common, but that unit takes 2.5qts, so not as big a deal.

 

[out]

Prepping for my 1st oil change, so tried to find an RHO oil change video on YouTube. None. But, a few on TRX. Interesting, the Hellcat has an oil cooler that also has a drain plug. Wondering about the RHO…anyone know if the engine in RHO has a separate oil cooler with its own drain?

Also, watched a few gear lube videos & both mentioned the front diff takes 1.5qts, but 99% of TRXs have only 1qt installed at the factory. Has anyone checked this on their RHO? Same for the transfer case…1/2qt low is common, but that unit takes 2.5qts, so not as big a deal.

No Separate oil cooler and drain on the RHO. Good to see they put the filter under the truck instead of on top like the 3.6. Much easier and less mess underneath.

 

[RHOfan]

Just completed my 1st oil change on RHO at 1206 miles…why?

This engine is very similar in output & configuration to the current BMW M3/4 Competition. BMW recommends that engine & all differential fluids be changed at 1200 miles. They are so serious about it, BMW even pays for this $2400 service.

Our differentials are not limited slip, so I’m just going to follow the “severe duty” recommendation of checking/changing the fluid at 30K miles, though I will probably confirm the front diff is full at some point in the near future (many came 1/2 quart low in TRX).

Transfer case is another story. Since there are clutches & slip (heat), that one is getting fluid changed out at 2500 miles.

For the oil filter removal, I used a 74/76mm 15 flute cap. The drain bolt is 13mm. I drained approximately 7 3/8 quarts total from the engine & filter. Guessing the additional 1/8 quart is in the filter media. The MOPAR filter part# is 68566307AB, and I got .4 quarts into it before install. Oil is factory spec Penzoil for SRT 0W-40.

Easy peasy. No need to remove any skid plates or jack it up. Though, a 6” socket wrench extension is highly recommended (by me).

I don’t have any torque specs for the drain plug or filter…did them by feel, as I’ve done for many vehicles over the years. The oil filter does have a pictorial on the side that appears to indicate it should be hand tightened + one turn. Maybe my hands are too strong (ha!), but 1/4 turn with the wrench after hand tight felt PLENTY snug!

 

[Cautionary Tale]

Just completed my 1st oil change on RHO at 1206 miles…why?

This engine is very similar in output & configuration to the current BMW M3/4 Competition. BMW recommends that engine & all differential fluids be changed at 1200 miles. They are so serious about it, BMW even pays for this $2400 service.

Our differentials are not limited slip, so I’m just going to follow the “severe duty” recommendation of checking/changing the fluid at 30K miles, though I will probably confirm the front diff is full at some point in the near future (many came 1/2 quart low in TRX).

Transfer case is another story. Since there are clutches & slip (heat), that one is getting fluid changed out at 2500 miles.

For the oil filter removal, I used a 74/76mm 15 flute cap. The drain bolt is 13mm. I drained approximately 7 3/8 quarts total from the engine & filter. Guessing the additional 1/8 quart is in the filter media. The MOPAR filter part# is 68566307AB, and I got .4 quarts into it before install. Oil is factory spec Penzoil for SRT 0W-40.

Easy peasy. No need to remove any skid plates or jack it up. Though, a 6” socket wrench extension is highly recommended (by me).

I don’t have any torque specs for the drain plug or filter…did them by feel, as I’ve done for many vehicles over the years. The oil filter does have a pictorial on the side that appears to indicate it should be hand tightened + one turn. Maybe my hands are too strong (ha!), but 1/4 turn with the wrench after hand tight felt PLENTY snug!

GREAT INFO! Thanks for being awesome and sharing the knowledge wealth