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This may assist: http://www.bobistheoilguy.com/forums/ubbthreads.php/topics/3568809/2

Originally Posted By: Najarro I have an Audi a8 with tiptronic gearbox (zf 6hp26) which had torque converter shudder. I updated the software and changed to the green atf used in Zf8hp gearbox and that problem is solved. However, once I have changed the atf, I have a jerk shift from 1 to 2 and...

Originally Posted By: Benito HTHS viscosity is more important than grade. The Euro oils must all have a minimum HTHSv of 3.5 regardless of if they are xw30 or xw40. However, Porsche and AMG require oils that are xw40 and not xw30. So if HTHSv is the most important thing, any idea on their...

Shannow, Nice description.

Originally Posted By: Snoman002 ...On the other hand, many of the L76's get a strong oil smell for a few days or weeks after an oil change. The rumor is because 'full' actually puts oil in contact with the crank and yo u get a lot of oil whipped up. I run mine half a quart low because of this...

Thanks Doug!

My takeaway was if that's what's happening with the camshaft, can you imagine the crankcase running at twice the speed with bigger "blades" (ie big ends and counterweighted crank throws) chopping at the streams of oil coming from the mains and the big ends and other locations such the return...

Originally Posted By: MolaKule The problem with "overfilling" is the potential for air entrainment which reduces the lubricating ability of the fluid. The manf. wants to try and avoid as much "whipping" of the oil and air entrainment as possible. One of the areas of whipping they try to...

Originally Posted By: wemay Again.... This is why it's so good: Mobil 1 0W-40 synthetic motor oil meets or exceeds the requirements of: API SN, SM, SL, SJ ACEA A3/B3, A3/B4 Nissan GT-R Mobil 1 0W-40 has the following builder approvals: MB-Approval 229.3 MB-Approval 229.5 BMW LONGLIFE...

Originally Posted By: dgjks6 ....The Porsche mechanic guys are the craziest. There are some people that only warranty their work if you use their oil, and blame all the 996 engine problems on oil. Fixed it for you! The reason why I'm on here too.

Well there you go! Thanks Supercity. I guess the question of feeling comfortable using a C3 formulation that also has 229.51 and A40 accreditation probably comes down to two things: Are you a high or a mid SAPS person and Do you have a DPF equipped diesel daily driver along with your classic...

Originally Posted By: Olas He will recommend the very best choice available On what basis will he use Olas?

Hi SDS, Could I clarify a few things please? I’ll just add notes to your original paragraphs to avoid any further confusion. Peter: I think you are creating a straw man. I don't think I have said there is only one viscosity or brand that is best, nor do I think LN/Charles Navarro is saying...

Originally Posted By: Doug Hillary Perhaps we've come a long way...................? I hope so Doug! I think we were operation off a very low base though! Just one question if you don't mind? Why A3/B3 rather than A3/B4? Thanks Peter PS: Pleased you saw the humour in my hypothetical and...

Let's ask a hypothetical question then! Let's say Doug is gifted a 1993 911 just like that owned by the OP. Let's also say that the Australian government quarantines any further imports of Mobil 1, Delvac, Castrol, Fuchs or Shell oils so he can't rely on personal experience any more. Let's also...

Originally Posted By: supercity Would people here feel comfortable using a C3 formulation that was 229.51 and A40 approved? Super, Is there such a beast? While C3 gives the required HTHS for our purposes, I would think the 229.5 and the C3 specs would be at odds with each other. Similarly...

Originally Posted By: sds911 Peter I'm not arguing with you. In fact Charles Navarro makes the same recommendation for the acea specs as you do. And states that a lower weight than 15w50 may be fine depending on ambient temps. Read the links I posted and you will find you and he are making...

Actually Doug is the only BITOG'er that I have read his every post and in many ways I followed him here from a number of Porsche forums he used to frequent. Isn't as creepy as it sounds I promise! I actually read a lot of your posts Garak and Shannow too. I would use Mobil 1 products as well...

Oh, I don't know about an "inordinate" emphasis on manufacturer recommendations but I think the original vehicle user manuals and the subsequent manufacturer TSB's are good place to start! What I've tried to do is place a contemporary interpretation on the manufacturer recommendations of the...

Hi SDS, I don't disagree with your logic of using the oil that Flat 6 recommend for your 996 given their and the M96 engine track record however I'm interested in moving the oil debate on from the common internet banter of brand X is great and brand Y is sh$t. There is simply insufficient...