Oil for old V8

Messages
131
Location
Sydney
I have an old 1987 V8 Holden. It has low kms on it (120,000) but unfortunately, was not been well maintained by its previous owner [No no] When I bought it, the oil looked ok and the engine was quiet. However, when I changed the filter, it was filled with grit and looked like it hadn't been changed in ages. I am guessing it had been used to filter oil that had been overused [Mad] Not long after, the pressure relief valve clogged up and caused zero oil pressure Anyway, frequent changes now have inevitably uncovered some valve noises (either from blocked oil passages or wear) and a rather alarming noise from the engine at startup in the 3 sec before the oil pressure rises at startup. It blows no smoke. I have been running dino 20W - 50 since there seems to be no Australian synthetic which is similar to this spec and this is what the engine is meant to use. I am thinking it couldn't hurt trying Mobil 1 5 - 50. Thoughts ?
 
Messages
231
Location
Ontario
Well for the rest of us North Americans Holdens are Australia's GM's. What size is this engine? 350 small block? I ran 15W50 Mobil 1 for a while in my 350 and had no problems. Started easy even on cold days. Recently went to 10W30 to see if mileage would increase.
 

Andrew

Thread starter
Messages
131
Location
Sydney
It's a small block 304. I would like to find some synthetic 15 - 50 but I can't seem to find any. Just 10 - 30, 0 - 40 and 5 - 50 formulations and the like.
 
Messages
43,652
Location
'Stralia
The holden V8s are pretty rough on caamshafts, most of the 253s that I've owned have worn a few lobes, and cupped the end of the lifter. Not sure whether it's an alignment issue or a lubrication issue. One had been run on LP gas and Mobil 1 and still had a couple of lobes go south. And with the oil pump mounted so far about oil level, they clatter pretty badly on start-up also. So something that gets to the top end quick, and has lots of anti-scuff stuff in it would be the go.
 
Messages
450
Location
Louisville, KY
A full syn would give u better start up protection, just about regardless of its weight. Even a 15w-50/20w-50 is pletny thin to flow fine in a australian summer. [Big Grin] DO some cleans, Wynns is pretty gentle and widely available in Australia. Also just pruior to oil change do the "idle w/ quart of ATF" thing. Thats effective enough to help but gentle enough not to cause potential prpoblems (unlike many kerosense based cleaners). Fred... [Smile]
 
Messages
2,480
Too many VI's in M-1, but not in Super S blend??? Can you explain??? So how many VI's are there in a 5-50?
 

Andrew

Thread starter
Messages
131
Location
Sydney
Noticed on another thread that Torco make a 20W - 50 full synthetic. I have seen it advertised in Australia too. Will be expensive though.
 
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