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I have car manual which says: 10W30. For Ambient temperature -25°C to 30°C 5W30. For Ambient temperature not more than -10°C This is not the 1st car manual saying such things. Now, my understanding has always been, 5W30 should also be usable up to 30°C but apparently not. Any reason why? BTW...

Hi, Present radiator already filled with Texaco's OAT but I need to do some topping up. Not a complete replacement. Can I use other brand's OAT like this one from Shell? http://www.shell.com/static/my-en/downloads/shell_for_businesses/autotrade/coolguard_pds.pdf

Can someone please tell me what's the exact chemistry beside Glycol? Thanks.

Hi. The manual calls for DOT3 brake fluid in brakes system. Can I use DOT4 instead? I am assuming I could but would like some confirmation. Thanks.

Hi. The manual calls for DOT3 brake fluid in brakes system. Can I use DOT4 instead? I am assuming I could but would like some confirmation. Thanks.

Hi. I am pretty clear about arguments for & against these for use in engine. But in axle in hot tropic climate? Please enlighten me. Thanks.

Hi. I have a Isuzu Trooper and the manual calls for either SAE90 or SAE140 or multigrade SAE80W140 in the real axle with LSD. The manual said multigrade like 80W90 are only suitable up to ambient temperature of 30 deg C. The ambient temperature here is 35 deg C and I have a few concerns. 1...

The sticker on a brand new Isuzu diesel pickup in dealer's yard says "Isuzu Long Life Coolant". Pop open the cap and it's the green stuff. Does anyone know for sure what sort of coolant does Isuzu use? OAT, HOAT or just the traditional green.

I have an Renault engined car (D4F 1.2L). Does anybody know for sure what's the coolant prefered by Renault? Traditional, OAT, HOAT? How about Toyota Long Life? Thanks.

Sorry, off topic. Does anyone know what the % efficiency of motor diesel engine vs gasoline? Thanks in advance.

Hi. Decided to remove the already 5-yrs old 100,000-km Texaco Extended Life Coolant from my Isuzu diesel engine. The radiator capacity is listed as ~8-liter. When the mechanic removed the old coolant and poured in the new Texaco coolant, could only manage to pour in 7-liters of the new coolant...

I am a bit blur on some of the oil issues and looking for someone to clear things up for me. Thanks in advance. Oil-A is 10W30 and Oil-B is 10W40. The way I understood it, at engine operating temperature, Oil-A will behave as 30 oil whereas Oil-B will behave as 40 oil. Am I correct to assume...

Hi. I am very confused about these three variant ELF TRANSELF oil, namely, the TRJ, TRP & TRT. My car actually calls for TRJ (mated to Renault D4F engine) but I am curious about the differences. According to this website, they are all API GL5, 75W80 and synthetic. Thanks...

My car fitted with Renault D4F 1.2 liter engine calls for Weston 936 coolant in the owner manual. Couldn't find any information on the 936. Can someone please shed some light on this? Thanks.

Hi. I run a Japanese diesel 4WD (Isuzu 4JG2-TC engine). I have always been undecided as to which of these 2 engine oil are better for my application, Delo 400 or Delo CXJ. On the one hand, the Delo400 seems to use better ISOSYN base oil but it’s additive package seems to be a compromise of...

Hi. I don’t quite understand some of these ACEA oil rating and hope someone here can clear thing up for me. Thanks in advance. Assuming 2 oils with these rating with same viscosity. Oil-1 has API SM/CF ACEA A3-98/B3-96/B4-98 DaimlerChrysler MB 229.1 Volkswagen VW 502.00 / 505.00 Oil-2 has API...

Hi. I believe this is the best site for asking my question on coolant. I have a Isuzu 4wd that has a 4JG2-TC diesel engine that was last filled with Texaco's Extended Life Coolant. Now it's about time to change the coolant again and would appreciate any suggestion. Thanks in advance.

Hi. I got a new car that uses Renault Clio (D4F SOHC 16V 1200cc) engine for use in the hot tropic. The manual says engine oil must fulfill minimum requirement of SAE 10W30. Does it means that I can use any of these: 0W30 5W30 10W30 10W40 And which one is best. But not something like: 15W40...