OCI on Shell Ultra

[Spetz]

Seeing as this is the highest cleaning oil, does this mean that OCI should be shorter than other oils? Car is 6G74 3.5L Mitsubishi Diamante, 120K miles

 

[pbm]

I would imagine that would depend on how dirty the engine is. If the engine is clean I would do a regular OCI but I'd shorten it (or maybe change the filter) if the engine appears to have sludge. I guess this oil is similar to Pennzoil's 'Ultra' here in America. Does it mention 'GTL' on the label?

 

[GreenFocus]

If the engine is clean, there is nothing to contaminate the oil and regular oci is fine. If engine is dirty, shorter oci is preferred.

 

[Spetz]

Yes I think this is identical to the Pennzoil Ultra. I've had the rocker covers off and the engine has no sludge, but everything has varnish on it (this is what I am hoping to remove).