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Gremlin X 343 Oil

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betanu961 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote betanu961 Quote  Post ReplyReply Direct Link To This Post Topic: Gremlin X 343 Oil
    Posted: Feb/18/2018 at 11:08am
I searched but couldn't find any information on this.

I have a 1974 Gremlin X with a 343 V8.  I generally use 10w30 conventional oil.  Anyway, when I took it in for regular service they changed the oil out and put 75w90 synthetic in its place (not sure why).  Will this cause any issues?


Edited by betanu961 - Feb/18/2018 at 1:54pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 73hornut Quote  Post ReplyReply Direct Link To This Post Posted: Feb/18/2018 at 11:56am
Originally posted by betanu961 betanu961 wrote:

I searched but couldn't find any information on this.

I have a 1974 Gremlin X with a 343 V8.  I generally use 10w30 conventional oil.  Anyway, when I took it in for regular service they changed the oil out and put 75w30 synthetic in its place (not sure why).  Will this cause any issues?
Probably 5w30, never heard of 75w30?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote amxdreamer Quote  Post ReplyReply Direct Link To This Post Posted: Feb/18/2018 at 12:29pm
or maybe 15w30...either way it will be fine.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 401MATCOUPE Quote  Post ReplyReply Direct Link To This Post Posted: Feb/18/2018 at 1:13pm
Depending on the health of the engine, you might start seeing oil leaks with synthetic oil after a life time of Conventional Oil.  If that 343 had a lot of miles, I have seen some engines start to use oil too....proceed with caution.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote betanu961 Quote  Post ReplyReply Direct Link To This Post Posted: Feb/18/2018 at 1:51pm
Not entirely sure how many miles were on the engine before it was installed into the Gremlin.  It came from a Javelin.

Do you think it would be prudent to drain the synthetic and put in 10w30 again?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote betanu961 Quote  Post ReplyReply Direct Link To This Post Posted: Feb/18/2018 at 1:55pm
Originally posted by 73hornut 73hornut wrote:

Probably 5w30, never heard of 75w30?

Sorry, it was 75w90.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jav343 Quote  Post ReplyReply Direct Link To This Post Posted: Feb/18/2018 at 2:18pm
Originally posted by betanu961 betanu961 wrote:

Originally posted by 73hornut 73hornut wrote:

Probably 5w30, never heard of 75w30?

Sorry, it was 75w90.


75W90 is gear oil...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tyrodtom Quote  Post ReplyReply Direct Link To This Post Posted: Feb/18/2018 at 2:23pm
There isn't a 75w90 engine oil either.
The thickest synthetic I've heard of is 15w50,   though some specialty makers may make something a little thicker,  but nobody even approaches 75w90 territory for engine oils.
75w90 is in the weights that gear oils commonly come in ,   no even semi-experienced mechanic would put that in a engine.

I think you heard them wrong. Or did they change your rear end oil too?
  First, you need to find out what they really put in your engine. 


Edited by tyrodtom - Feb/18/2018 at 3:16pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote amc67rogue Quote  Post ReplyReply Direct Link To This Post Posted: Feb/18/2018 at 3:44pm
Sniff the oil on the dipstick ,Gear oil usually has a sulpher oder to it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lyle Quote  Post ReplyReply Direct Link To This Post Posted: Feb/19/2018 at 11:59am
Take it back and have them change the oil again (for free) if the receipt states 75W90 or have a different shop change the oil.
Gear oil should not be in an engine and I wouldn't gamble on an engine for the sake of an oil change.
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