GQ patrol RB30 engine oil change

Hi Austravel,Ive got a 4.2 efi gq ,I change the oil every 10,000kms.Why does it matter if its a carby verion? or not. Its the 1st i ever read that.I had a 4.2 deisel which i would do every 5,000 kms.Could you let me know what the reasons are when you know thanks
regards uppy

Hi Austravel
I have a 1989 RB30e powered Skyline as my primary car, whcih has the EFI version of your motor.
I have owned it for past 6 years, and aquired it at 198000km on the clock.
Since then I have ensured it has had regular oil changes, in between 5000km and 7000km, but never past this. I believe a good service routine ensures the longetivity of this motor, as mine has now got 338000km on it. Of course mine doesn't have the load of a 2-tonne fourby to lug around, but if you can afford the more regular oil changes as you have done then very good. Two things this motor needs to last forever, Oil and Coolant.
Without knowing the mileage on yours, I would assume that it is your induction causing some of the oil fouling (as others here mentioned), as mine still runs fairly clean, again the EFI does contribute to a cleaner running engine overall.
I don't know if it is pratical or cost effective to see if you can put EFI on yours, I guess it depends on how much you love your GQ! I believe the carby version has been water and dust proofed compared tot hat of the EFI, so would have to consider this with a transplant as well.
Hope this helps
Cheers

Hi Austravel

Regarding your oil change's I use to own a VL commodore which is the same engine just with EFI. I did oil and filter at every 5000 k's and when I sold the car it nearly did 580,000 k's with no sign of ever wearing out. I used Shell Helix Ultra ( as I work at the Shell Refinery in Geelong keep myself in a job lol ) oil is cheap compared to a engine rebuilt. Now with the oil changing colour dont worry its doing its job, all engine oils have detergents in them and thus designed to keep the bore and rings clear of carbon build up as well in other area's in the motor. Oil changing also depends on how you drive the vehicle if its city driving stop start or hard 4wdriving and yes every 5000k's if it highway stuff as in driving non stop for a 100k's or so 7500 - 10000 k's change the oil is ok. It's because when stop start and short cold trips the oil tends to build up crap in it. But on long trips when the engine is hot and full operating temp some of that garde will burn off.
So changing your oil every 5000 and filter will not harm your engine.

Regards
Rossco

With regarding the tapits that is standard on RB30 mine did it as well. It may get worse over time and it may not just keep and eye on it. I replaced mine I think around 220,000 k's or so.

Rossco

Thanks to all for the info and comments.