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Gremlin X 343 Oil

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Category: The Garage
Forum Name: AMC V8 Engine Repair and Modifications
Forum Description: AMC-made V8 engine mechanical, ignition and fuel from basic repair to high-perf modifications
URL: https://theamcforum.com/forum/forum_posts.asp?TID=92584
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Topic: Gremlin X 343 Oil
Posted By: betanu961
Subject: Gremlin X 343 Oil
Date Posted: Feb/18/2018 at 10:08am
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?



Replies:
Posted By: 73hornut
Date Posted: Feb/18/2018 at 10:56am
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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74 Gremlin
79 Spirit AMX
Rogue Valley Rumblers
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Posted By: amxdreamer
Date Posted: Feb/18/2018 at 11:29am
or maybe 15w30...either way it will be fine.

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Tony
Vancouver, BC
1970 AMX
1972 Badassador
AMO#10333


Posted By: 401MATCOUPE
Date Posted: Feb/18/2018 at 12:13pm
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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Ross K. Peterson
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Posted By: betanu961
Date Posted: Feb/18/2018 at 12:51pm
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?


Posted By: betanu961
Date Posted: Feb/18/2018 at 12:55pm
Originally posted by 73hornut 73hornut wrote:

Probably 5w30, never heard of 75w30?

Sorry, it was 75w90.


Posted By: jav343
Date Posted: Feb/18/2018 at 1:18pm
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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2000 Dodge Durango SLT 4.7L, 1997 Jeep Wrangler 4.0L, 1968 AMC Javelin 5.6L 


Posted By: tyrodtom
Date Posted: Feb/18/2018 at 1:23pm
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. 


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66 American SW, 66 American 2dr, 82 J10, 70 Hornet, Pound, Va.


Posted By: amc67rogue
Date Posted: Feb/18/2018 at 2:44pm
Sniff the oil on the dipstick ,Gear oil usually has a sulpher oder to it.

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Keith Coggins 67Rogue X code


Posted By: Lyle
Date Posted: Feb/19/2018 at 10:59am
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.


Posted By: wantajav
Date Posted: Feb/19/2018 at 3:42pm
What kind of in-breds work at that shop?Clown

I wouldn't drive it 10 ft if there really was 75W-90 in there. 

You could drain some out into a container and see how it pours compared to 10W-30. 

Like the other guy said, usually gear oil has a pretty sharp smell to it...that's the other sign.

(Hopefully they just clicked on the wrong drop down item on the shop computer menu and they really did use 10W-30.)..but if you think by looks or smell the wrong oil is in there....

I'd go to Walmart get a jug of 10W-30 a new oil filter and change it right where it is parked.

Then I'd go back to the shop with the Walmart receipt and talk to the manager. They should refund the original oil change cost and your Walmart change.

Either that car is reading 80 psi at idle or the top end is getting no oil when it is cold, way too thick to run in your engine.



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