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castrol gtx 10-40 engine oil
- 84kz1000p
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- MFolks
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Best Oils To Use In Your Bike (Just My Opinion)
Engine oil : The commercial grade oils are clearly superior to the mass market oils. For the best protection in your bike or car, use Shell Rotella Synthetic, available at Wal-Mart in blue containers . For the best petroleum oil you can buy, get Shell Rotella T, Mobil Delvac 1300, or Chevron Delo 400, available at any auto parts store. On the back of most oil cans is a circular stamp with the certification. Avoid oils that say "energy conserving" in the bottom half of the donut.
These oils contain friction modifier additives that could cause clutch slipping over time. The EPA mandated certain gas mileage, so the auto makers turned to the oil manufacturers who came up with friction modifiers of the oil to meet these new standards. All XXw-20 and XXw-30 oils are energy conserving, and should not be used in your motorcycle. Don't buy any oil additives like STP or Slick-50. Here's several listings on all about oil justifying these conclusions.
The Recommended Synthetic Oils :
Shell Rotella Synthetic
5w-40 Delvac 1 Synthetic
5w-40 AMSOil AMF Synthetic (pricey, but it’s your money)
10w-40 Golden Spectro Synthetic
10w-50 Motul 5100 Synthetic
10w-40 Mobil-1 Synthetic
15w-50 Mobil-1 MX4T Synthetic
The best synthetics are: (in no particular order)
Shell Rotella-T Synthetic 5w-40 (blue container is synthetic, not white which is dino), gallon at Wal-Mart.
Mobil Delvac-1 5w-40 (grey container is synthetic, not black which is dino), gallon at Petro stations, gallon at Farm and Fleet.
Mobil-1 SUV 5w-40, qt anywhere.
AMSOil AMF 10w-40 synthetic motorcycle oil. (again, pricey)
Golden Spectro Supreme, (no price).
Motul 5100 Ester, (no price).
Mobil-1 automotive oils all contain small amounts of moly - about 100 to 200 ppm. This can cause clutch slippage in some motorcycles. I've only heard of this being a problem in Honda Shadows.
The Recommended Petroleum Oils
Chevron Delo 400 15w-40
Delvac 1300 15w-40
Shell Rotella 15w-40
The best petroleum oils are: (in no particular order)
Chevron Delo 400 15w-40 (blue container) gallon at any auto parts store, gallons at Costco.
Mobil Delvac 1300 15w-40 (black container) gallon at any auto parts store, gallons at Sam's Club.
Shell Rotella-T 15w-40 (white container) gallon at Wal-Mart or any auto parts store, gallons at Sam's Club.
Castrol 15w-40 (Green container) gallon at Wal-Mart or any auto parts store, gallons at Sam’s club.
1982 GPZ1100 B2
General Dynamics/Convair 1983-1993
GLCM BGM-109 Tomahawk, AGM-129A Advanced Cruise Missile (ACM)
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- 650ed
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The ingredients in oils have changed over the years. For example, today's Castrol GTX oil (and pretty much all other AUTOMOBILE oil) is not the same as it was in the 1980's. Back then it worked great in KZ bikes. But, things have changed. Early AUTOMOBILE oils contained zinc phosphorus compounds (ZDDP) to protect engines from metal to metal contact. This was good for engines, but it was found to be destructive to catalytic converters. Consequently, in AUTOMOBILE oils ZDDP was virtually eliminated and replaced with different chemistry generically referred to as "Friction Modifiers." These work fine and offer good protection for normal AUTOMOBILE engines. However, today's AUTOMOBILE oil "Friction Modifiers" are destructive to wet clutches. KZ bikes (and many other brands) have wet clutches. As a result of these oil chemistry changes a distinction needed to be made between those oils which are suitable for wet clutches and those which are not. That distinction was documented by the Japanese Engine Oil Standards Implementation Panel (JASO). JASO developed a number of different oil specifications for different applications. The specifications that apply to 4 stroke motorcycles fall under the "4T Specifications." Within the 4T specifications the JASO MA class oils are specifically formulated for 4 stroke motorcycles with wet clutches.
Using oils that are not designated as meeting the JASO-MA standard may be destructive to KZ clutches. Here's a link that may be helpful:
www.oilspecifications.org/jaso.php
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- 4TheKZ1000
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- bountyhunter
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I ran it for many decades, back then it was the best available. I think it's OK oil, the 10-40 grade should not have any moly in it. I think Rotella is better, but Castrol is pretty good.84kz1000p wrote: anyone have any problems with or have anything to say about running Castrol GTX 10-40 in an 84' kz1000p ?
1979 KZ-750 Twin
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- 650ed
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1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- RonKZ650
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321,000 miles on KZ's that I can remember. Not going to see any more.
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- bountyhunter
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In the early 80's, Castrol GTX was the only oil with additives that were strong enough to work in a bike. My dealer used it exclusively and said to use nothing else. Today, there are "commercial" rated oils like Rotella that are certified for diesel service with strong additive packages which will work in a bike.
You can just buy "bike" oil, but like anything labeled for use in a bike, it's priced at about 3X what it's worth.
1979 KZ-750 Twin
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- Sorf
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- 650ed
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www.ils.co.nz/b1webtools/assets/downloads/SKU%20TDS/4101146.pdf
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- Old Man Rock
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Then switch to Mobil 1 synthetic...
OR.... :whistle:
1976 KZ900-A4
MTC 1075cc.
Camshafts: Kawi GPZ-1100 .375 lift
Head: P&P via Larry Cavanaugh
ZX636 suspension
MIKUNI, RS-34'S...
Kerker 4-1, 1.5" comp baffle.
Dyna-S E.I.
Earls 10 row Oil Cooler
Acewell 2802 Series Speedo/Tach
Innovate LC1 Wideband 02 AFR meter
Phoenix, Az
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- mtbspeedfreak
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Oil is the lifeblood of these bikes.
2000 ZRX 1100
1976 KZ 900- Daily Driver
1980 LTD 550- Dalton Highway survivor!
If it has tits or tires, it'll give you problems!
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