Diesel oil too good for my old engine?

Russell

I have just swapped oils in my 1991 patrol TD42 with Safari Turbo. I was told to use RX Super by the supplier and also by the guys at Turbotech. Does that mean I have the wrong oil in it???

hello zapper, the short answer is you may have, the long answer is ;
those within the industry are well aware of some problems with changing to CI-4, proved by the fact that some of the majors are either currently reformulating their CI-4 oils in an effort to slove some of the problems.
ask any of them and they will most likely say no problems as they have been saying for a year or so now, "try our CI-4 oil it is better ... best".
any vehicle that has been on CH-4 for most of its life may not experience any problems going to CI-4, but those that have been on CF-4 and CG-4 most likely will.
from this you will get differing opinions and experiences re CI-4 depending in most cases, on what they have been using.
nissans own handbook will say use CF-4 and Jaso DH-1 ratings and this cannot be ignored.
it is my firm belief that you can go to CH-4 but must stay with Jaso DH-1, so we make both a CF-4 and a CH-4, both with Jaso DH-1.
RX when i checked with castrol technical 2 weeks ago, does not pass Jaso DH-1.
i am often bemused by owners being guided by fools with no knowledge or respect.
ask any one that has changed to CI-4 and i would nearly bet that the only answer will be "the salesman told me to" or words to that effect.
i have not heard any reasonable technical reason for the change but have heard many horror stories from those that have.
to those that have changed with no problems, great and good luck for the future, to those that have not changed to CI-4 my advice would be not to do so.
regards, russell

Thanks Russell

Sort of answers my question. I didn't change oils cause the salesman told me, I have run Mobil Delvac for ages only cause we use it on the farm but its so hard to get hold of here in the city that I decided to can it and use Castrol as all the truck stores etc sell it. So I asked the guys at a couplke of Castrol selling places and they told me RX Super, then I rang Turbotech to ask them what they reccommend and they said the same and they had been using it for ages. Now I dont know what I should use, only just did the oil change last week. When did the change to CI-4 take place. I use RX super in my 1986 Mitsubishi truck also which is turboed, does that mean it would be unsuitable for that too?? I rang the Castrol technical line today twice and had to leave message, no one rang me back.

I saw the opening post to this question said they were using GTX Diesel but my wagon is turboed and I thought GTX wouldn't be suitable. What synforce oil would you suggest?

Thanks Russell

for the Nissan, our Prosyn DH-1, it is a 15w/40 semi synthetic CF-4 and Jaso DH-1 rated oil, check our web site for details, ragards, russell

sorry zapper, i did not read your reply properly, so i have another go.
firstly, japanese diesels are recommended to have a medium ash oil and i am not aware of any jap manufacturer recommending low ash or even CI-4 rating.
RX super whilst being a damm fine oil, is considered to be lower ash and rated at CI-4, so on recomendations and specs etc, it is not the right choice for the mitsy or nissan.
CI-4 was first licenced in late 2002 and came in with different brands during 2003 - 2004.
the above motors would have most likely initially been running on CF-4,
and then on CH-4. regards, russell