Redline Shockproof: MR2 Gearbox Longevity

The enduring appeal of the Toyota MR2, particularly its later generations, often sparks discussions about maintaining these capable sports cars. A frequent topic of conversation, especially amongst enthusiasts who push their vehicles, revolves around gearbox oil. One particular product that frequently surfaces is Redline's Shockproof. This article delves into the intricacies of this specialized lubricant, exploring its properties, potential benefits, and whether it's a viable, or even advantageous, option for your beloved MR2.

Understanding Redline Shockproof

Redline Shockproof isn't your typical gear oil. It's a unique blend designed to offer superior protection under extreme pressure and shock loads. Unlike conventional gear oils that rely solely on their viscosity, Shockproof possesses a distinctive characteristic: it forms a tenacious, waxy coating on metal surfaces. This coating is the key to its enhanced protective capabilities. When gears, bearings, and synchros are in motion, they are constantly bathed in this fluid. However, under extreme stress, the fluid's base components may be squeezed out, leaving behind this resilient, protective film. This film acts as a buffer, preventing metal-to-metal contact, which is the primary cause of wear and damage in a gearbox.

The Science Behind the "Shockproof" Name

The name "Shockproof" itself hints at its primary function. In high-performance applications, gears experience immense forces, particularly during rapid acceleration, deceleration, and gear changes. These events can generate significant shock loads that can overwhelm standard lubricants. Shockproof is formulated to withstand these shocks. The waxy coating it deposits provides a continuous layer of protection, absorbing and dissipating these intense forces. This significantly reduces the stress on the gear teeth and bearings, thereby extending their lifespan. Anecdotal evidence from experienced mechanics and racers suggests that this protective coating can effectively double the lifespan of gearbox components in demanding environments.

User Experiences and Observations

The efficacy of Redline Shockproof is often best understood through the experiences of those who have used it. One notable account comes from an individual who first encountered Shockproof at Russell Racing, a renowned racing preparation facility. While working with Formula Mazda gearboxes, they observed a significant improvement in gear longevity after switching from conventional gear oil to Shockproof. The team was supplied with the fluid by Redline as part of a sponsorship agreement. Through regular inspections of over twenty gearboxes that utilised Shockproof, they consistently noted its remarkable ability to protect internal components.

The observed characteristic of Shockproof is that it leaves a faint, waxy, yellowish coating on gear surfaces, even after the gearbox has been thoroughly cleaned. This coating is not easily removed and is believed to be the source of its protective qualities. Furthermore, this waxy film exhibits a certain tackiness or grip. When two metal surfaces coated with Shockproof are brought together and rotated, there's a noticeable resistance, a shear characteristic. This subtle grip is theorised to be beneficial for the synchroniser rings, which are responsible for matching the speeds of gears during shifts. The improved synchro engagement is a benefit many users report.

Shockproof and Synchromesh Systems

The interaction between Redline Shockproof and synchromesh systems is a point of frequent discussion. Redline themselves advises against using Shockproof in transmissions equipped with certain types of synchros. The reasoning often cited is that Shockproof, due to its extreme slipperiness under very high loads, might not be ideal for all synchro designs. However, the user experience mentioned earlier suggests the opposite: the coating provided by Shockproof might actually enhance synchro performance. The tackiness of the coating could provide the necessary friction for the synchro rings to engage more effectively, leading to smoother and more positive gear changes. This is a crucial point for any MR2 owner who values precise shifting.

Considerations for Transmissions with Pumps

Another caution from Redline pertains to transmissions fitted with internal oil pumps. The concern is that the thicker, more viscous nature of Shockproof, particularly the heavier variants, could potentially clog the oil pump's pickup screen. This could lead to a lack of lubrication and subsequent component failure. While this is a valid theoretical concern, the practical experience of many users suggests that this is not a widespread issue. The aforementioned racer, for instance, has been using Heavy Shockproof in their turbocharged 1993 MR2 since 2005, accumulating over 270,000 miles without any gearbox issues, including shifting problems. This suggests that for many applications, the benefits of Shockproof outweigh the potential risks, provided the fluid is used within reasonable parameters and the transmission is not inherently prone to pump pickup blockages.

Choosing the Right Shockproof Variant

Redline offers several variations of Shockproof, each with slightly different viscosity and performance characteristics:

For the MR2, the choice of Shockproof variant often depends on the car's intended use and the specific gearbox. For a road-going MR2 that sees occasional spirited driving, the standard or even Lightweight Shockproof might be ideal, offering a good balance of protection and smooth shifting. If the MR2 is used for track days or has a significantly modified engine producing higher torque, the Heavy Shockproof could be a more suitable option to provide maximum protection against wear and tear. It's always advisable to consult with experienced MR2 tuners or mechanics for specific recommendations based on your car's setup.

Will the MR2 Be Back on the Road with Shockproof?

The question of whether the MR2 will be "back on the road" with Redline Shockproof is a testament to the enduring spirit of this car and its community. Based on the evidence and user experiences, Redline Shockproof appears to be a highly effective lubricant for enhancing gearbox longevity and, potentially, improving shift quality in MR2s. The unique protective coating it provides is a significant advantage, especially in performance applications. While caution is advised regarding transmissions with pumps, for the vast majority of MR2 owners, using Shockproof is unlikely to cause harm and may very well extend the life of their gearbox, keeping their beloved car on the road for years to come. The key is to select the appropriate variant for your specific needs and driving conditions.

Frequently Asked Questions

Is Redline Shockproof suitable for all MR2 models?

Shockproof is generally suitable for most MR2 models, but the choice of variant (Lightweight, Standard, Heavy) should be considered based on the car's age, mileage, power output, and intended use. Consult with a specialist if unsure.

Can Shockproof improve my MR2's shifting?

Many users report smoother and more precise shifting after switching to Shockproof, particularly the lighter variants. The unique coating may assist the synchroniser rings.

Will Shockproof damage my gearbox if it has a pump?

There's a theoretical risk of the oil pump pickup screen becoming clogged with thicker Shockproof variants. However, practical experience suggests this is rare. If your gearbox has a history of oil circulation issues, caution is advised.

How often should I change the gearbox oil with Shockproof?

While Shockproof offers superior protection, it's still a lubricant that degrades over time. A change every 30,000-50,000 miles, or annually if driven infrequently, is a good general guideline, but consult your vehicle's manual or a specialist for specific intervals.

Where can I buy Redline Shockproof?

Redline Shockproof is available from specialist automotive performance parts retailers, both online and in physical stores. It's always best to purchase from reputable sources to ensure authenticity.