Question: Why does my 94 take 8 quarts of oil?? - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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Old 11-30-2019, 06:34 PM   #1 (permalink)
Chicagomike
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Why does my 94 take 8 quarts of oil??

I purchased a '94 Suburban c2500 6.5TD from an elderly neighbor ...lots of low grade deferred maintanence--but the first thing I did was change oil. It had a full size style AC/Delco oil filter (pre-pf1218). I replaced filter with a WIX filter (which is slightly smaller) and 7 quarts of oil (including filter)--as per 1994 engine specs. After letting it settle--it was low (as per dipstick)--ended up adding the remaining quart--which brought it right up to the line on the dipstick. Its been about 3 months and its getting quite cold here---so decided to change again (original oil was like mud--so an extra short change period couldn't hurt) to Mobil 5-30. Again--it took exactly 8 quarts.

So---everyone tells me that the 94 should take 7 quarts--and the 99 engine and up takes 8 quarts...and I guess either the dipstick is wrong---or maybe an engine swap was done?? neighbor is now in nursing home--and not available to ask. Or did a 94 ever have a larger oil capacity than usually listed. Its an "F" vin.

There are a few other clues--fuel return lines replaced with 3/8 Softline and fueline from lift pump up was also replaced with 3/8 line--ie..not hard line.

Any easy way to tell if engine was swapped out? or--if dipstick was replaced with a wrong one (is that possible) am I over filling.

Inquiring minds want to know...help!

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1994 Suburban c2500 6.5TD. 200,000+ miles. Leroy Diesel lift pump override, PTWiring glow plug harness, new glow plugs, new injectors, new harmonic balancer, belt tensioner, and vacuum pump. Just adding a catch can and new CDR tomorrow....

Last edited by OkDually; 11-30-2019 at 07:10 PM. Reason: sig
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Old 11-30-2019, 06:54 PM   #2 (permalink)
JMJNet
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The Suburban Club Member

YOU NEED DIESEL RATED MOTOR OIL which is mostly 15w-40 or 5w-40.

There is no diesel rated 5w-30 oil from Mobil.

Diesel rated oil specification usually start with a Cx like CK or CJ.
The oil with SN or SM rating is only for gasser.

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Old 11-30-2019, 08:14 PM   #3 (permalink)
Glagulator
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Describe the dip stick handle or upload a photo.
Dip stick should have a part number on it.
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99 CREW LONG SRW C3500 work truck 199k+ mi. orig. motor & trans 4.10, modded engine harness, new oil cooler & lines, all new front end parts and poly bushings, trans poly mount, all new brakes.
96 SUBURBAN K2500 wife's truck 210k+ mi. orig. motor & trans, 3.73...
95 C2500 Suburban 6.5td HO w/p, timing set, HB & pulley, all rubber hoses, modded engine & main harness, converted to OBD2, PMD to bumper...
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Old 12-01-2019, 12:59 AM   #4 (permalink)
crankme69
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Most likely the oil stick tube has either been changed or adjusted upwards...
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2005 FLHTC 107 Twin Cam Tman 625 cams, 10.1 CR, Mik 45, DTT map, 3.37 final, E1 clutch & VPC with SE 6 sp, SnS roller rockers Bub 7 2 into 1 exhaust, 120Tq & 120Hp

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Old 12-01-2019, 01:22 AM   #5 (permalink)
57diesel
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A question for some of the other experts here, since he has a C truck is it possible it has a different oil pan? From a van or an H1? Or like someone else was saying maybe the engine / dipstick tube is from another engine with the C truck pan. I actually don't know is the C and K truck the same pan?


The 5-30 oil also caught my eye too just because its not that commonly used for our trucks. It is the OEM oil for a lot of current diesels so you do find it on the shelves now in many stores. Mobil does make a 5w-30 version in the Delvac line so as long as that is what he has and isn't planning on working it hard especially when it warms up again he should be fine.
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Last edited by 57diesel; 12-01-2019 at 01:24 AM.
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Old 12-01-2019, 03:24 AM   #6 (permalink)
Chicagomike
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Thanks for all the good ideas...I will upload a photo of dipstick..and look for part number. BTW...I do use Delvac...which around these parts is common diesel winter oil. I am not working engine hard at this point..as I'm still kind of trying to put it in good working order.
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1994 Suburban c2500 6.5TD. 200,000+ miles. Leroy Diesel lift pump override, PTWiring glow plug harness, new glow plugs, new injectors, new harmonic balancer, belt tensioner, and vacuum pump. Just adding a catch can and new CDR tomorrow....

Last edited by OkDually; 12-01-2019 at 09:27 AM. Reason: sig
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Old 12-01-2019, 03:25 AM   #7 (permalink)
Chicagomike
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Oh...and I misspoke ... it is 5w40 delvac...!
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1994 Suburban c2500 6.5TD. 200,000+ miles. Leroy Diesel lift pump override, PTWiring glow plug harness, new glow plugs, new injectors, new harmonic balancer, belt tensioner, and vacuum pump. Just adding a catch can and new CDR tomorrow....

Last edited by OkDually; 12-01-2019 at 09:28 AM. Reason: sig
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Old 12-01-2019, 03:48 AM   #8 (permalink)
101Volts
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Quote:
Originally Posted by Chicagomike View Post
Oh...and I misspoke ... it is 5w40 delvac...!
Phew, relief. Never ever use a Gasoline-only oil in a Diesel engine. There's some tolerance for Diesel oil in Gas engines but it's not the same the other way around.
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Old 12-01-2019, 11:22 AM   #9 (permalink)
kmagg
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My 94 takes 8 quarts to get to the Full mark. I was always used to putting 7 quarts in my Dad's 6.2's over the years. I put 7 in the 94 the first oil change and when I checked it, it was low. Every oil change since, I put in 7, check it, and have to add the 8th quart. Not sure if the engine is original since the truck had almost 200K miles when I got it, but it appeared to be unmolested.
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Old 12-01-2019, 02:17 PM   #10 (permalink)
Chicagomike
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Attached is photo of dipstick. Part number is 10244633.

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1994 Suburban c2500 6.5TD. 200,000+ miles. Leroy Diesel lift pump override, PTWiring glow plug harness, new glow plugs, new injectors, new harmonic balancer, belt tensioner, and vacuum pump. Just adding a catch can and new CDR tomorrow....
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